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Conference presentations (talks and posters)

Talks 2021

  • *Bernhard Reischl, Roope Halonen, Ivo Neefjes, Huan Yang, Valtteri Tikkanen, Theo Kurtén and Hanna Vehkamäki: Collision rate enhancement of atmospheric molecules, ions, and clusters, due to long-range interactions, Nordic Society for Aerosol Research Symposium 2021, online March 2021
  • Olli Pakarinen, Golnaz Roudsari, Bernhard Reischl, Hanna Vehkamäki: Effect of water confinement on heterogeneous ice nucleation, Nordic Society for Aerosol Research Symposium 2021, online March 2021
  • *Olli Pakarinen, Cintia Pulido Lamas, Golnaz Roudsari, Bernhard Reischl, and Hanna Vehkamäki: The role of latent heat in heterogeneous ice nucleation. EGU General Assembly 2021 (vEGU21), online April 2021. Solicited talk. 
  • J.Kubecka, T.Kurten, H.Vehkamaki: Quantum chemistry applied to atmospheric processes, CLOUD Modelling Workshop (ONLINE), May 2021
  • *Olli Pakarinen, Golnaz Roudsari, Bernhard Reischl, Hanna Vehkamäki: Effect of water confinement on heterogeneous ice nucleation, Liquid Matter Conference (LMC 2021), Online, July 2021.

Posters 2021

  • Bernhard Reischl, Golnaz Roudsari, Siiri Turtola, Olli H. Pakarinen and Hanna Vehkamäki: Towards understanding heterogeneous ice nucleation on realistic silver iodide surfaces from atomistic simulation, LMC 2021 conference, Online, July 2021.
  • Valtteri Tikkanen, Kayane Dingilian, Roope Halonen, Bernhard Reischl, Barbara Wyslouzil and Hanna Vehkamäki: Molecular dynamics simulations of homogeneous CO2 nucleation, Nordic Society for Aerosol Research Symposium 2021, online March 2021.
  • Valtteri Tikkanen, Kayane Dingilian, Roope Halonen, Bernhard Reischl, Barbara Wyslouzil and Hanna Vehkamäki: Molecular dynamics simulations of homogeneous CO2 nucleation, EGU General Assembly 2021, Online, April 2021. 
  • Golnaz Roudsari, Bernhard Reischl, and Olli Pakarinen: Liquid Water and InterfacialCubicand Hexagonal Ice Classification through Eclipsed and Staggered Conformation Template Matching, CECAM Mixed-Gen Session 1: Activated events, online January 2021.

Talks 2020

  • Fatemeh Keshavarz, Hanna Vehkamäki and Theo Kurtén: Molecular mechanisms behind the health impacts of several organic aerosol components, Atmospheric Chemical Mechanisms Conference (online), November 2020.
  • Fatemeh Keshavarz, Theo Kurtén and Hanna Vehkamäki: Basicity and acidity promote hydrolysis of methyl nitrate in aqueous aerosols, European Geosciences Union (EGU) General Assembly (Online), May 2020.
  • *Valtteri Tikkanen, Kayane Dingilian, Roope Halonen, Bernhard Reischl, Barbara Wyslouzil and Hanna Vehkamäki: Molecular dynamics simulations of homogeneous CO2 nucleation, European Aerosol Conference EAC 2020, Online, September 2020.
  • *Hanna Vehkamäki, Dina Alfaouri, Vitus Besel, Roope Halonen, Stephen Ingram, Fatemeh Keshavarz, Jakub Kubečka, Ivo Neefjes, Olli Pakarinen, Monica Passananti, Bernard Reischl, Golnaz Roudsari, Anna Shcherbacheva, Valtteri Tikkanen and Tommaso Zanca, plenary lecture: ’Molecular cluster formation models for atmospherically relevant systems’ Virtual NOSA2020 minisymposium, 27.5.2020.
  • *Hanna Vehkamäki, Dina Alfaouri, Vitus Besel, Roope Halonen, Stephen Ingram, Fatemeh Keshavarz, Jakub Kubečka, Ivo Neefjes, Olli Pakarinen, Monica Passananti, Bernard Reischl, Golnaz Roudsari, Anna Shcherbacheva, Valtteri Tikkanen and Tommaso Zanca: ’Atmospherically Relevant Molecular Level Cluster Formation Model’ Symposium on size selected clusters S3C, Davos, Switzerland, 23.-28.2.2020.
  • Tommaso Zanca, Jakub Kubečka, Evgeni Zapadinsky, Monica Passananti, Theo Kurtén, and Hanna Vehkamäki: HOM cluster decomposition in APi-TOF mass spectrometers, EGU General Assembly 2020, Online, May 2020.

Posters 2020

  • Angelica Bianco, Dina Alfaouri, Juha Kangasluoma, Monica Passananti: Improving the separation of structural isomers in APi-TOF using Differential Mobility Analyser (DMA), CIMS users' meeting, Online, 12-15.5.2020.
  • Bernhard Reischl, Golnaz Roudsari, Siiri Turtola, Olli H. Pakarinen and Hanna Vehkamäki: Towards understanding heterogeneous ice nucleation on realistic silver iodide surfaces from atomistic simulation, EGU General Assembly 2020, Online, May 2020. 
  • Olli Pakarinen, Golnaz Roudsari, Bernhard Reischl, Hanna Vehkamäki: Effect of water confinement on heterogeneous ice nucleation, EGU General Assembly 2020, Online, May 2020. 
  • J.Kubecka, V.Besel, T.Kurten, H.Vehkamaki: Presence of humidity in atmospheric new-particle formation, MATHEMATICS FOR ATMOSPHERIC-BIOSPHERIC SCIENCE: AtMath Workshop, Himos, Finland, January 2020.
  • *J.Kubecka, V.Besel, T.Kurten, H.Vehkamaki: Presence of humidity in atmospheric new-particle formation, (GRS) Molecular and Ionic Clusters (Seminar + Conference), Ventura, USA, February 2020.
  • *Tommaso Zanca, Jakub Kubečka, Evgeni Zapadinsky, Monica Passananti, Theo Kurtén, and Hanna Vehkamäki: HOM cluster decomposition in APi-TOF mass spectrometers, AtMath Workshop, Himos, January 2020.
  • Olli H. Pakarinen, Golnaz Roudsari, Evgeni Zapadinsky, Hanna Vehkamäki: Effect of surface geometry on heterogeneous ice nucleation, AtMath Workshop, Himos, January 2020.
  • Dina Alfaouri, Monica Passananti , Nanna Myllys, Tommaso Zanca, Evgeni Zapadinsky, Lauri Ahonen, Jakub Kubecka, Juha Kangasluoma, and Hanna Vehkamäki: Cluster Fragmentation inside an Atmospheric Pressure interface Time Of Flight Mass Spectrometer, AtMath Workshop, Himos, January 2020.

Talks 2019

  • *Bernhard Reischl, Golnaz Roudsari, Siiri Turtola, Olli H. Pakarinen and Hanna Vehkamäki: Towards understanding heterogeneous ice nucleation on realistic silver iodide surfaces from atomistic simulation, IAMA 2019 conference, UC Davis, CA, USA 4.-6.12.2019
  • *Fatemeh Keshavarz, Theo Kurtén and Hanna Vehkamäki: Dust aerosols alter formation of secondary organic aerosols through accretion reactions, 12th European Conference on Computational and Theoretical Chemistry, Perugia, Italy 1.-5.9.2019
  • *Bernhard Reischl, Roope Halonen, Evgeni Zapadinsky, Theo Kurtén and Hanna Vehkamäki: Rate enhancement in collisions of sulphuric acid molecules due to long ranged intermolecular interactions.  European Aerosol Conference, Gothenburg, Sweden 25.-30.8.2019
  • Petri Clusius, Tinja Olenius, Jonas Elm, Pontus Roldin, Hanna Vehkamäki and Michael Boy: The Role of NH3 and DMA in New Particle Formation in a Boreal Forest Environment.  European Aerosol Conference, Gothenburg, Sweden 25.-30.8.2019
  • D. J. Shang, M. Hu, K. D. Lu, P. Roldin, J. Größ, S. Kecorius, Y. S. Wu, T. Olenius, B. Birger, L. M. Zeng, Y. H. Zhang, Z. J. Wu, Wiedensohler, H. Vehkamäki and M. Boy. New particle formation in the North China Plain, European Aerosol Conference, Gothenburg, Sweden 25.-30.8.2019
  • Monica Passananti, Evgeni Zapadinsky, Nanna Myllys, Dina Alfaouri, Tommaso Zanca, Juha Kangasluoma, Matti P. Rissanen, Theo Kurtén, Mikael Ehn, Michel Attoui and Hanna Vehkamäki: Fragmentation of clusters inside a mass spectrometer: experimental evidences and simulation results, European Aerosol Conference, Gothenburg, Sweden 25.-30.8.2019
  • Dina Alfaouri, Nanna Myllys, Evgeni Zapadinsky, Frans Korhonen, Lauri Ahonen, Tommaso Zanca, Jakub Kubecka, Juha Kangasluoma, Monica Passananti and Hanna Vehkamäki: A study on the fragmentation of sulfuric acid dimethylamine clusters inside an Atmospheric Pressure interface Time Of Flight Mass Spectrometer (APi-TOF MS), European Aerosol Conference, Gothenburg, Sweden 25-30.08.2019
  • *Hanna Vehkamäki: Modelling atmospheric cluster formation.  CECAM-Aalto sponsored workshop , 14.-15.8.2019 Nuuksio, Finland
  • Bernhard Reischl, Roope Halonen, Evgeni Zapadinsky, Theo Kurtén and Hanna Vehkamäki: Rate enhancement in collisions of sulphuric acid molecules due to long ranged intermolecular interactions.  CECAM-Aalto sponsored workshop , 14.-15.8.2019 Nuuksio, Finland
  • Bernhard Reischl, Golnaz Roudsari, Olli H. Pakarinen and Hanna Vehkamäki: Effect of defects on heterogeneous ice nucleation on silver iodide surfaces.  CECAM-Aalto sponsored workshop , 14.-15.8.2019 Nuuksio, Finland
  • Anna Shcherbacheva, T. Balehowsky, T. Olenius, T. Helin, H. Haario, Marko Laine, T. Kurtén, H. Vehkamäki: Identification of molecular cluster evaporation rates, formation enthalpies and entropies by Monte Carlo method. CECAM-Aalto sponsored workshop , 14.-15.8.2019 Nuuksio, Finland
  • Tommaso Zanca, Jakub Kubečka, Evgeni Zapadinsky, Monica Passananti, Nanna Myllys, Theo Kurtén and Hanna Vehkamäki: Numerical predictions on HOM cluster fragmentation in APi-TOF mass spectrometers, CECAM-Aalto sponsored workshop , 14.-15.8.2019 Nuuksio, Finland
  • Jakub Kubecka; V. Besel; T. Kurtén; H. Vehkamäki: Quantum chemistry of atmospheric molecular clusters. 23rd Air Ions, Clusters and Atmospheric Aerosols Workshop, Helsinki, June 2019 
  • Tommaso Zanca, Evgeni Zapadinsky, Monica Passananti, Nanna Myllys, Theo Kurtén and Hanna Vehkamäki: Modelling the fragmentation of ionized atmospheric clusters in APi-TOF mass spectrometer, XXIII Air Ions, Clusters and Atmospheric Aerosol Workshop, Helsinki, June 2019 
  • Jakub Kubecka; V. Besel; T. Kurtén; H. Vehkamäki: Molecular clusters: configurational sampling and global minimum search. CECAM - Machine learning, Helsinki, May 2019
  • Tommaso Zanca, Evgeni Zapadinsky, Monica Passananti, Nanna Myllys, Theo Kurtén and Hanna Vehkamäki: Modelling the fragmentation of ionized atmospheric clusters in APi-TOF mass spectrometer, Physics Days 2019, Helsinki, March 2019

Posters 2019

  • Vitus Besel; J. Kubecka; T. Kurtén; H. Vehkamäki: Computational Studies on Atmospheric Sulfuric Acid - Ammonia Clusters. CoE2019, Helsinki, November 2019
  • Jakub Kubecka; V. Besel; T. Kurtén; H. Vehkamäki: Atmospheric molecular clusters: presence of water. CoE2019, Helsinki, November 2019
  • Jakub Kubecka; V. Besel; T. Kurtén; H. Vehkamäki: Jammy Key for Configurational Sampling: Atmospheric Molecular Clusters. APATCC2019, Sydney, October 2019
  • Jakub Kubecka; V. Besel; T. Kurtén; H. Vehkamäki: Jammy Key for Configurational Sampling: Atmospheric Molecular Clusters. EAC2019, Gothenburg, August 2019
  • Vitus Besel; J. Kubecka; T. Kurtén; H. Vehkamäki: Computational Studies on Atmospheric Sulfuric Acid - Ammonia Clusters. EAC2019, Gothenburg, August 2019
  • Anna Shcherbacheva, T. Balehowsky, T. Olenius, T. Helin, H. Haario, Marko Laine, T. Kurtén, H. Vehkamäki: Identification of molecular cluster evaporation rates, formation enthalpies and entropies by Monte Carlo method. EAC2019, Gothenburg, August 2019
  • Tommaso Zanca, Jakub Kubečka, Evgeni Zapadinsky, Monica Passananti, Nanna Myllys, Theo Kurtén and Hanna Vehkamäki: Modelling the Fragmentation of ionized atmospheric clusters in APi-TOF mass spectrometers, EAC2019, Gothenburg, August 2019
  • Olli H. Pakarinen and Hanna Vehkamäki: Ice nucleation in pits on silicon and silver iodide surfaces, EAC2019, Gothenburg, August 2019
  • Vitus Besel; J. Kubecka; T. Kurtén; H. Vehkamäki: Computational Studies on Atmospheric Sulfuric Acid - Ammonia Clusters. CECAM - Machine learning, Helsinki, May 2019  
  • Golnaz Roudsari, Bernhard Reischl, Olli H. Pakarinen and Hanna Vehkamäki: Effect of defects on heterogeneous ice nucleation at silver iodide surfaces.  EGU 2019 General Assembly, Vienna, Austria, April 2019
  • Olli Pakarinen, Cintia Pulido Lamas, and Hanna Vehkamäki: Ice nucleation in confined geometry and the role of latent heat, EGU 2019 General Assembly, Vienna, Austria, April 2019
  • Olli Pakarinen, Cintia Pulido Lamas, Hanna Vehkamäki: Ice nucleation in confined geometry and the role of latent heat, Physics Days 2019, Helsinki, March 2019
  • Jakub Kubecka; V: Besel; T. Kurtén; H. Vehkamäki: Atmospheric molecular clusters participating in new particle formation, Physics Days 2019, Helsinki, March 2019


Talks 2018

  • *Olli Pakarinen, Cintia Pulido Lamas, Golnaz Roudsari, Tuomo Ponkkonen, Hanna Vehkamäki: Heterogeneous Ice Nucleation in confined geometry, 2nd Atmospheric Ice Nucleation Conference, Grasellenbach, Germany, February 26 - March 1, 2018.
  • *Nanna Myllys: Quantum chemistry in atmospheric studies AND Oxidized organic compounds in new-particle formation, Invited talk: UC Irvine, California, USA, January 24, 2018.
  • *Nanna Myllys, J. Elm, T. Olenius, and T. Kurtén: Oxidized organic compounds in the initial steps of particle formation, NOSA, Helsinki, March 25-27, 2018.
  • *Olli Pakarinen, Golnaz Roudsari, Hanna Vehkamäki: Effect of Surface Geometry on Heterogeneous Ice Nucleation, PICO presentation, European Geosciences Union General Assembly 2018, Vienna, Austria, 8 – 13 April 2018.
  • Nanna Myllys: Quantum chemistry in atmospheric studies AND Oxidized organic compounds in new-particle formation, Invited talk: King's College London, UK, May 4, 2018.
  • Tommaso Zanca: A model for cluster fragmentation in APi-ToF, XXII Annual Air Ion and Aerosol Workshop, Pühajärve (Estonia), May 8-9, 2018
  • Jakub Kubecka: Configurational sampling of non-covalently bonded molecular clusters, Computational Chemistry Days, Helsinki (Finland), 28th-29th May 2018
  • *Passananti M., Myllys N., Elm J., Ponkkonen T., Kurtén T., Olenius T., Vehkamäki H.: Key components in new particle formation: sulfuric acid clusters with guanidine and diamines,The 677. WE-Heraeus-Seminar - Towards a molecular understanding of atmospheric aerosols, Bad Honnef, Germany, August 26-31, 2018. 
  • *Passananti M., Zapadinsky E., Kangasluoma J., Myllys N., Attoui M., Vehkamäki H.: Is it possible to predict the fragmentation of clusters inside an Atmospheric Pressure interface Time Of Flight (APi-TOF) mass spectrometer?, Chemical Ionization Mass Spectrometer Meeting 2018 (CIMS Meeting 2018), Seattle, Washington, USA, June 6-9, 2018
  • *Passananti M., Zapadinsky E., Kangasluoma J., Myllys N., Attoui M., Vehkamäki H.: Study on cluster fragmentation inside an Atmospheric Pressure interface Time Of Flight (APi-TOF) mass spectrometer, Aerosol Technology (AT2018), Bilbao, Spain, June 17-20, 2018.
  • Zapadinsky E., Passananti M., Myllys N., Vehkamäki H.: Modelling on fragmentation of clusters inside a mass spectrometer, 22nd Annual Air Ions, Clusters and Atmospheric Aerosols Workshop, Pühajärve, Estonia, May 7-9, 2018.M. 
  • *Passananti,E. Zapadinsky, J. Kangasluoma, N. Myllys, M. Attoui, and H. Vehkamäki: Fragmentation of Ionised Atmospheric Clusters Inside a Mass Spectrometer, 22nd European Conference on the Dynamics of Molecular Systems (Molec2018) 26 - 31st August 2018, Dinard, France.
  • *M. Passananti,E. Zapadinsky, J. Kangasluoma, N. Myllys, M. Attoui, and H. Vehkamäki: Fragmentation of Ionised Atmospheric Clusters Inside a Mass Spectrometer, 2018 International Aerosol Conference, St. Louis, Missouri, USA, September 2-7, 2018.
  • *Olli Pakarinen, Golnaz Roudsari, Cintia Pulido Lamas, Bernhard Reischl, Hanna Vehkamäki: Thermostat artefacts and role of latent heat in ice nucleation, CECAM-Aalto workshop, Hvittorp, Finland, 13th-14th September 2018
  • *Bernhard Reischl : Thermostats and barostats in Molecular Dynamics simulations, CECAM-Aalto workshop, Hvittorp, Finland, 13th-14th September 2018
  • *Roope Halonen:  Deviation from equilibrium conditions in molecular dynamic simulations of homogeneous nucleation, CECAM-Aalto workshop, Hvittorp, Finland, 13th-14th September 2018
  • *Evgeni Zapadinski : Thermostatting in complex systems. Merging with probabilistic approach, CECAM-Aalto workshop, Hvittorp, Finland, 13th-14th September 2018
  • *Monica Passananti, Evgeni Zapadinsky, Juha Kangasluoma,Nanna Myllys, Michel Attoui, Hanna Vehkamäki: Characterising cluster fragmentation in an Atmospheric Pressure interface Time of Flight (APi-ToF) mass spectrometer, Atmospheric Chemical Mechanisms Conference, UC Davis Conference Center, USA, 5.12.2018
  • *Monica Passananti, Evgeni Zapadinsky, Juha Kangasluoma,Nanna Myllys, Michel Attoui, Hanna Vehkamäki: Model and experiments to characterise cluster fragmentation inside an Atmospheric Pressure interface Time Of Flight (APi- TOF) mass spectrometer, Towards a Molecular Understanding of Atmospheric Aerosols- 677. WE-Heraeus-Seminar, Bad Honnef, Germany 27.-31.8 2018
  • Hanna Vehkamäki: Understanding nanoparticle formation in the atmosphere, Computational Chemistry Days 2018, University of Helsinki, Finland, 28.-29.5. 2018
  • *Monica Passananti, Evgeni Zapadinsky, Juha Kangasluoma,Nanna Myllys, Michel Attoui, Hanna Vehkamäki: Understanding Particles Forming from Thin Air, Gordon Re- search Seminar on Molecular and Ionic Clusters - Microscopic Probes of Intermolecular Forces and Cooperative Effects Lucca (Barga), Italy, 25.2 - 2.3. 2018
  • Bernhard Reischl, Roope Halonen, Nanna Myllys, Monica PassanantiDina AlfaouriEvgeni Zapadinsky and Hanna Vehkamäki: Molecular Dynamics simulations of sulfuric acid cluster collisions, Centre of Excellence meeting, Kuopio, Finland 27.-29. 11. 2018
  • *Bernhard Reischl, Roope Halonen, Nanna Myllys, Monica PassanantiDina AlfaouriEvgeni Zapadinsky and Hanna Vehkamäki: Molecular Dynamics simulations of sulfuric acid cluster collisions, ACM2018 Atmospheric Chemical Mechanisms conference, UC Davis, CA, USA, 5.-7. 12. 2018

Posters 2018

  • Golnaz Roudsari, Olli Pakarinen, Hanna Vehkamäki: Heterogeneous Ice Nucleation by Mineral Dusts in Mixed Phased Clouds: Molecular Dynamics Simulations, 2nd Atmospheric Ice Nucleation Conference, Grasellenbach, Germany, February 26 - March 1, 2018.
  • Jakub Kubecka: Configurational sampling of atmospheric molecular clusters, GRC, Lucca [Barga] (Italy), 25th February - 2nd March 2018
  • Olli Pakarinen, Golnaz Roudsari, Hanna Vehkamäki: Effect of Surface Geometry on Heterogeneous Ice Nucleation, NOSA-FAAR, Helsinki, March 25-27, 2018
  • Jakub Kubecka: Configurational sampling of atmospheric molecular clusters, NOSA-FAAR, Helsinki (Finland), 25th-27th March 2018
  • Bernhard Reischl, Monica Passananti, Nanna Myllys, Roope Halonen, Evgeni Zapadinsky and Hanna Vehkamäki: Molecular dynamics simulations of sulfuric acid cluster collisions, NOSA-FAAR, Helsinki, Finland, March 25-27, 2018
  • Passananti M., Zapadinsky E., Kangasluoma J., Myllys N., Reishl B., Halonen R., Attoui M., Vehkamäki H.: Study on fragmentation of atmospheric clusters inside a mass spectrometer,NOSA-FAAR, Helsinki, Finland, March 25-27, 2018
  • Anna Shcherbacheva: Modeling the impact of background gas pressure on the fragmentation inside the Atmospheric Pressure interface Time Of Flight (APi- TOF) mass spectrometer. NOSA-FAAR, Helsinki, March 25-27, 2018
  • Olli Pakarinen, Golnaz Roudsari, Cintia Pulido Lamas, Hanna Vehkamäki: Affecting the Arctic conditions by ice nuclei, Academy ARKTIKO program meeting, Lammi, Finland, May 4-5, 2018
  • Jakub Kubecka: Configurational sampling of non-covalently bonded molecular clusters, ICQC, Menton (France), 18th-23th June 2018
  • Tommaso Zanca: Modelling the fragmentation of ionized clusters in APi-ToF mass spectrometer, MOLEC2018, Dinard (France), August 26-31, 2018
  • Olli Pakarinen, Golnaz Roudsari, Evgeni Zapadinsky and Hanna Vehkamäki: Effect of Surface Geometry on Heterogeneous Ice Nucleation, 2018 International Aerosol Conference, St. Louis, Missouri, USA, September 2-7, 2018
  • Jakub Kubecka: Artificial bee colony algorithm used for configurational sampling of molecular clusters, CECAM-AALTO workshop, Hvittorp (Finland), 13th-14th September 2018
  • Tommaso Zanca: Modelling the fragmentation of ionized clusters in APi-ToF mass spectrometer, CECAM-AALTO workshop, Hvittorp (Finland), 13th-14th September 2018
  • Golnaz Roudsari, Bernhard Reischl, Olli Pakarinen, Hanna Vehkamäki: Effects of defects on heterogeneous ice nucleation at silver iodide surfaces, CECAM workshop on heterogeneous ice nucleation, Lausanne, September 18-21, 2018
  • Olli Pakarinen, Cintia Pulido Lamas, Hanna Vehkamäki, Ice nucleation in confined geometry and the role of latent heat, CECAM workshop on heterogeneous ice nucleation, Lausanne, September 18-21, 2018
  • Tommaso Zanca: Modelling the fragmentation of ionized clusters in APi-ToF mass spectrometer, FCoE, Kuopio (Finland), November 27-29, 2018
  • Evgeni Zapadinsky, Monica Passananti, Nanna Myllys and Hanna Vehkamäki: Modelling on Atmospheric Cluster Fragmentation Inside a Mass Spectrometer, Aerosol Technology (AT2018), Bilbao, Spain, June 17-20, 2018
  • Golnaz Roudsari, Bernhard Reischl, Olli Pakarinen, Hanna Vehkamäki: Effects of defects on heterogeneous ice nucleation at silver iodide surfaces, Centre of Excellence meeting, Kuopio, Finland, 27-19.11.2018
  • Anna Shcherbacheva, T. Balehowsky, T. Olenius, T. Helin, H. Haario, Marko Laine, T. Kurtén, H. Vehkamäki: Parameter identification of molecular cluster enthalpies and entropies by Monte Carlo method. ACM2018 Atmospheric Chemical Mechanisms conference, UC Davis, CA, USA, 5.-7. 12. 2018

Talks 2017

  • Olli Pakarinen, Tuomo Ponkkonen, Hanna Vehkamäki: Modelling the role of surface microstructure in heterogeneous nucleation of ice, Physics Days 2017, Helsinki, Finland, March 22-24, 2017.
  • *Olli Pakarinen, Tuomo Ponkkonen, Hanna Vehkamäki: Modelling the Role of Surface Structure in Heterogeneous Nucleation of Ice, Atmospheric Ice Nucleation Conference, The Aerosol Society, Leeds, UK, 16.-17.1.2017. 
  • Passananti M., Rissanen M.P., Yan C., He X.C., Kangasluoma J., Bianchi F., Junninen H., Ehn  M., Vehkamäki H.: Fragmentation of sulfuric acid-ammonia clusters inside a CI-APi-TOF, Finnish Physics Days 2017, Helsinki, Finland, March 22-24, 2017.
  • *Nanna Myllys, Tinja Olenius, Jonas Elm, Theo Kurtén, Hanna Vehkamäki and Ilona Riipinen: The Effect of Bisulfate, Ammonia, and Ammonium on the Clustering of Organic Acids and Sulfuric Acid, NOSA, Lund, Sweden, March 20-22, 2017.
  • Nanna Myllys, Jonas Elm, and Theo Kurtén: Going Beyond Rigid Rotor-Harmonic Oscillator Approximation, Computational Chemistry Days, Jyväskylä, May 29-30, 2017.
  • Nanna Myllys: Quantum Chemistry in Atmospheric Studies, Invited talk: Summer Seminar in Atmospheric Analytical Chemistry, Espoo, May 31, 2017.
  • *Olli Pakarinen, Tuomo Ponkkonen, Hanna Vehkamäki: Role of surface structure in heterogeneous nucleation of ice, 20th International Conference on Nucleation and Atmospheric Aerosols (ICNAA2017), Helsinki, Finland, June 25-30, 2017.
  • Passananti M.: Fragmentation of sulfuric acid clusters inside the Atmospheric Pressure Interface, Chemical Ionization Mass Spectrometer Meeting 2017 (CIMS Meeting 2017), Helsinki, Finland, 12-15 June 2017.
  • *Passananti M., Rissanen M.P., Yan C., He X.C., Kangasluoma J., Bianchi F., Junninen H., Ehn M., Vehkamäki H.: Fate of atmospheric clusters inside a mass spectrometer (CI-APi-TOF), European Aerosol Conference, Zurich, Switzerland, August 27 - September 1, 2017.
  • Nanna Myllys, Jonas Elm, Viivi Hirvonen, Theo Kurtén, and Hanna Vehkamäki: Oxidized Organic Compounds in Atmospheric Clustering, CoE, Helsinki, 4-6 October, 2017.
  • *Hanna Vehkamäki: Techniques to model atmospheric nanoclusters CECAM-Aalto sponsored workshop , 27.-28.11.2017, Tallinn
  • Hanna Vehkamäki: Studying particles forming out of thin air, Mathematics for Atmospheric- Biospheric Science 2017 AtMath kick-off conference Levi, Finland, 20-24.11 2017

Posters 2017

  • Anna Shcherbacheva: COMSOL modeling of gas pressure and velocity in CI API-TOF, Mathematics for atmospheric-biospheric science conference, Levi, Finland, November 20-24, 2017.
  • Golnaz Roudsari and Olli Pakarinen: Heterogeneous ice nucleation by mineral dusts in mixed phased clouds: molecular, Mathematics for atmospheric-biospheric science conference, Levi, Finland, November 20-24, 2017.
  • Evgeni Zapadinsky, Monica Passananti and Hanna Vehkamäki: Modelling the fragmentation of the clusters in time-of-flight mass spectrometer, Mathematics for atmospheric-biospheric science conference, Levi, Finland, November 20-24, 2017.
  • Roope Halonen, Evgeni Zapadinsky and Hanna Vehkamäki: Molecular dynamics simulations and isothermal homogeneous nucleation, Mathematics for atmospheric-biospheric science conference, Levi, Finland, November 20-24, 2017.
  • Roope Halonen, Evgeni Zapadinsky and Hanna Vehkamäki: Non-equilibrium cluster properties and non-isothermal nucleation, Mathematics for atmospheric-biospheric science conference, Levi, Finland, November 20-24, 2017.
  • M. Passananti, J. Kangasluoma, E. Zapadinsky, M.R. Rissanen, N. Myllys, H. Junninen, M. Ehn, M. Attoui and H. Vehkamäki: Fate of sulfuric acid clusters inside the APi-TOF, CoE, Helsinki, 4-6 October, 2017.
  • M. Passananti, J. Kangasluoma, M. Attoui and H. Vehkamäki: Atmospheric cluster analysis by tandem DMA-MS, European Aerosol Conference 2017, Zurich, Switzerland, August 27 - September 1, 2017.
  • Jakub Kubecka: New approach for configurational sampling of atmospheric molecular clusters, Mathematics for atmospheric-biospheric science conference, Levi, Finland, November 20-24, 2017.
  • Passananti M., Rissanen M.P., Yan C., He X.C., Kangasluoma J., Bianchi F., Junninen H., Ehn  M., Attoui M., Vehkamäki H., What happens to sulfuric acid-amine clusters inside the APi-TOF ?, 20th International Conference on Nucleation and Atmospheric Aerosols (ICNAA2017), Helsinki, Finland, 25-30 June 2017.
  • Nanna Myllys, Tinja Olenius, Jonas Elm, Theo Kurtén, Hanna Vehkamäki and Ilona Riipinen: The Effect of Ions on the Clustering of Organic Acids and Sulfuric Acid, ISTPC, Aussois, France, June 18-July 1, 2017.
  • Nanna Myllys, Tinja Olenius, Jonas Elm, Theo Kurtén, Hanna Vehkamäki and Ilona Riipinen: The Effect of Bisulfate, Ammo- nia, and Ammonium on the Clustering of Organic Acids and Sulfuric Acid, ICNAA, Helsinki, Finland, June 25-30, 2017
  • Roope Halonen, Evgeni Zapadinsky and Hanna Vehkamäki: Molecular dynamics simulations and isothermal homogeneous nucleation, 20th International Conference on Nucleation and Atmospheric Aerosols (ICNAA2017), Helsinki, Finland, June 25-30, 2017. 165. 
  • Roope Halonen, Evgeni Zapadinsky and Hanna Vehkamäki: Non- equilibrium cluster properties and non-isothermal nucleation, 20th International Conference on Nucleation and Atmospheric Aerosols (ICNAA2017), Helsinki, Finland, June 25-30, 2017.
  • Olli Pakarinen, Tuomo Ponkkonen, Hanna Vehkamäki: Molecular- level perspective on active sites in ice nucleation, Academy ARKTIKO program meeting, Oulu, Finland, May 9-10, 2017

Talks 2016

  • Jonas Elm: "Implication of Autoxidation Products in Atmospheric New Particle Formation", NOSA, Aarhus.
  • Olli Pakarinen, Tuomo Ponkkonen, Hanna Vehkamäki: Atomistic modeling of heterogeneous nucleation of ice. European Aerosol Conference 2016, 4-9.9.2016, Tours, France. (presented by H. Vehkamäki)
  • Hanna Vehkamäki: Understanding Arctic Ice Clouds, Academy of Finland ARKTIKO Programme Annual Seminar, Helsinki, Finland, 10.-11.5.2016.
  • Joonas Merikanto, Jonathan Duplissy , Anni Määttänen , Henning Henschel , Neil Donahue, David Brus, Siegfried Schobesberger, Markku Kulmala, Hanna Vehkamäki: Neutral and ion-induced H2SO4 - H2O particle formation 1: New theory. European Aerosol Conference 4.-9.9.2016 Tours, France.
  • Olli Pakarinen, Tuomo Ponkkonen, Hanna Vehkamäki: Atomistic modelling of heterogeneous nucleation of ice. BACG annual meeting, Leeds, UK, 28.-30.6.2016.
  • Hanna Vehkamäki: Overview of the goals of ERC project DAMOCLES, CECAM Aalto-sponsored workshop 30.-31.8.2016, Hvittorp, Finland
  • Hanna Vehkamäki: Molecular clustering in the atmosphere, COST MOLIM conference on Energy-Resolved Methods in Helsinki, August 22- 24.8.2016
  • M. Passananti, J. Kangasluoma, E. Zapadinsky, M.R. Rissanen, N. Myllys, H. Junninen, M. Ehn, M. Attoui and H. Vehkamäki: Fate of sulfuric acid clusters inside the APi-TOF, CoE, Helsinki, 4-6 October, 2017.
  • M. Passananti, J. Kangasluoma, M. Attoui and H. Vehkamäki: Atmospheric cluster analysis by tandem DMA-MS, European Aerosol Conference 2017, Zurich, Switzerland, August 27 - September 1, 2017.
  • Passananti M., Rissanen M.P., Yan C., He X.C., Kangasluoma J., Bianchi F., Junninen H., Ehn M., Attoui M., Vehkamäki H.: What happens to sulfuric acid-amine clusters inside the APi-TOF?, 20th International Conference on Nucleation and Atmospheric Aerosols (ICNAA2017), Helsinki, Finland, June 25-30, 2017. 
  • Nanna Myllys, Tinja Olenius, Jonas Elm, Theo Kurtén, Hanna Vehkamäki and Ilona Riipinen: The Effect of Ions on the Clustering of Organic Acids and Sulfuric Acid, ISTPC, Aussois, France, June 18-July 1, 2017. 
  • Nanna Myllys, Tinja Olenius, Jonas Elm, Theo Kurtén, Hanna Vehkamäki and Ilona Riipinen: The Effect of Bisulfate, Ammonia, and Ammonium on the Clustering of Organic Acids and Sulfuric Acid, ICNAA, Helsinki, Finland, June 25-30, 2017. 
  • Roope Halonen, Evgeni Zapadinsky and Hanna Vehkamäki: Molecular dynamics simulations and isothermal homogeneous nucleation, 20th International Conference on Nucleation and Atmospheric Aerosols (ICNAA2017), Helsinki, Finland, June 25-30, 2017.
  • Roope Halonen, Evgeni Zapadinsky and Hanna Vehkamäki: Non-equilibrium cluster properties and non-isothermal nucleation, 20th International Conference on Nucleation and Atmospheric Aerosols (ICNAA2017), Helsinki, Finland, June 25-30, 2017.
  • Olli Pakarinen, Tuomo Ponkkonen, Hanna Vehkamäki: Molecular-level perspective on active sites in ice nucleation, Academy ARKTIKO program meeting, Oulu, Finland, May 9-10, 2017

Posters 2016

  • Jonathan Duplissy, Joonas Merikanto, Anni Määttänen, Henning Henschel, Neil Donahue, David Brus, Markku Kulmala, Hanna Vehkamäki: Neutral and ion-induced H2SO4 - H2O particle formation 2: CLOUD experimental data spanning all atmospheric conditions. European Aerosol Conference 4.-9.9.2016 Tours, France
  • Anni Määttänen, Joonas Merikanto, Henning Henschel, Jonathan Duplissy, Ismael K. Ortega, Hanna Vehkamäki: Neutral and ion-induced H2SO4 - H2O particle formation 3: new improved parameterization. European Aerosol Conference 4.-9.9.2016 Tours, France
  • Nanna Myllys, Jonas Elm, Theo Kurtén, Hanna Vehkamäki: Computational approach for studying the participation of ketodiperoxy acids in atmospheric new particle formation. European Aerosol Conference 4.-9.9.2016 Tours, France
  • Matti Ala-Lahti, Hanna Vehkamäki, Oona Kupiainen-Määttä, Roope Halonen: Molecular collision frequency with a dipole-dipole interaction. European Aerosol Conference Tour France 4.-9.9.2016
  • Nanna Myllys, Jonas Elm, Roope Halonen, Theo Kurtén, Hanna Vehkamäki: Computational approach for studying large atmospheric acid-base clusters, NOSA 4.-6.4.2016, Aarhus, Denmark.
  • Nanna Myllys, Jonas Elm, Theo Kurtén, Hanna Vehkamäki: The participation of ketodiperoxy acids in atmospheric new-particle formation, MQM 7.-9.6.2016, Uppsala, Sweden.
  • Nanna Myllys, Jonas Elm, Theo Kurtén, Hanna Vehkamäki: Computational approach for studying the participation of highly oxidized organic compounds in atmospheric new-particle formation, TACC 28.8-2.9.2016, Seattle, USA.
  • Olli Pakarinen, Tuomo Ponkkonen, Hanna Vehkamäki: ICINA: Molecular level theory & validation, Academy of Finland ARKTIKO programme yearly seminar, Helsinki, Finland, 10.-11.5.2016.
  • Olli Pakarinen, Tuomo Ponkkonen, Hanna Vehkamäki: Modelling the role of surface structure in heterogeneous nucleation of ice, Royal Society: Nucleation: past and future challenges for experiment, theory and simulation meeting, Chicheley Hall, UK, 5.-6.9.2016.

Talks 2015

  • N. Myllys , J. Elm, T. Kurtén, H. Vehkamäki: Modelling atmospheric new-particle formation using multi-step quantum chemical methods. International Aerosol Modeling Algorithms conference, Davis, California, 9.-11.12.2015.
  • J. Kontkanen, T. Olenius, H. Vehkamäki, K. Lehtipalo, K. E. J. Lehtinen, and M. Kulmala: Investigating the Growth of Atmospheric Molecular Clusters Using a Dynamic Cluster Model. International Aerosol Modeling Algorithms (IAMA) 2015, December 9-11, 2015, Davis, California, USA. (presented by Ilona Riipinen)
  • Hanna Vehkamäki, Matti Ala-Lahti, Nicolai Bork, Jonas Elm, Roope Halonen, Henning Henschel, Oona Kupiainen-Määttä, Theo Kurtén, Ville Loukonen, Nanna Myllys, Tinja Olenius, Ismael Ortega, Olli Pakarinen, Tuomo Ponkkonen, Kai Ruusuvuori, And Narcisse Tsona: An overview of University of Helsinki computational aerosol physics group activities in 2014-2015. Annual seminar of The Centre of Excellence in Atmospheric Science - From Molecular and Biological processes to The Global Climate, Kuopio 22.-24.9.2015.
  • Hanna Vehkamäki, Jenni Kontkanen, Tinja Olenius, Katrianne Lehtipalo, and Markku Kulmala: Growth rates of atmospheric molecular clusters determined from cluster appearance times and collision–evaporation fluxes. European Geosciences Union General Assembly 2015, Vienna, Austria,12 – 17 April 2015.
  • Julin, J., Murphy, B. N., Olenius, T., Kupiainen-Määttä, O., Patoulias, D., Fountoukis, C., Vehkamäki, H., Pandis, S. N., and Riipinen, I.: Investigating the regional scale impacts of amine- sulphuric acid nucleation. NOSA-FAAR Symposium Kuopio, 12–13 March 2015.
  • O. H. Pakarinen, H. Vehkamäki: Role of lattice mismatch in heterogeneous nucleation of ice. Aerosol Technology Conference, 15 -17 June 2015, Tampere, Finland.
  • N. T. Tsona, H. Henschel, N. Bork, H. Vehkamäki: Hydration and electrical mobility of bisulfate ion-sulfuric acid-ammonia/dimethyl amine clusters from computational studies. Aerosol Technology Conference, 15 -17 June 2015, Tampere, Finland.
  • J. Elm, N. Myllys, N. Hyttinen and T. Kurtén: "Implication of Highly Oxidized Organic Compounds in Atmospheric New Particle Formation". European Aerosol Conference, Milan, 6-11 September, 2015.
  • O. H. Pakarinen, M. Backman, F. Djurabekova, K. Nordlund, Y. Zhang, P. Kluth, M. C. Ridgway, and W. J. Weber: Molecular dynamics simulations of swift heavy ion induced damage and recovery processes. SHIM 2015, May 18-21, 2015, Darmstadt, Germany. Invited talk.
  • O. H. Pakarinen and H. Vehkamäki: Role of lattice mismatch in heterogeneous nucleation of ice. European Aerosol Conference, Milan, Italy, September 6-11, 2015.
  • O. H. Pakarinen, T. Ponkkonen and H. Vehkamäki: Atomistic Modeling of Heterogeneous Nucleation of Ice. International Aerosol Modeling Algorithms (IAMA) 2015, December 9-11, 2015, Davis, California, USA.
  • Henschel, H.; Kupiainen-Määttä, O.; Olenius, T.; Kurtén, T.; Vehkamäki, H. Quantum Chemical Calculations on Atmospheric Particle Formation from Sulfuric Acid, Amines, and Water. BBCL 20th Anniversary Symposium, Kalmar, Sweden, December 2015.
  • Henschel, H.; Sipilä, M.; Sarnela, N.; Jokinen, T.; Richters, S.; Kangasluoma, J.; Franchin, A.; Peräkylä, O.; Kontkanen, J.; Junninen, H.; Rissanen, M.; Ehn, M.; Berndt, T.; Petäjä, T.; Worsnop, D.; Ceburnis, D.; Kulmala, M.; O’Dowd, C.; Kurtén, T.; Vehkamäki, H. Molecular Processes in Coastal Particle Formation Involving Iodine Oxides. 12th Informal Conference on Atmospheric and Molecular Science, Aarhus, Denmark, June 2015.
  • Henschel, H.; Kupiainen-Määttä, O.; Olenius, T.; Kurtén, T.; Vehkamäki, H. Modelling the Effect of Hydration on Atmospheric New Particle Formation from Sulphuric Acid and Amines. Physics Days, Helsinki, Finland, March 2015.

Posters 2015

  • A simulation-based method for determining collision and evap- oration rates from measured cluster distributions O. Kupiainen- Määttä, H. Vehkamäki. Aerosol Technology Conference, 15 -17 June 2015 Tampere, Finland. 
  • N. Myllys , T. Kurtén, O. Kupiainen-Määttä, T. Olenius, H. Vehkamäki: Modelling atmospheric acid-base clustering using coupled cluster methods. The 15th International Congress of Quantum Chemistry, Beijing, China, 8.-13.6.2015.
  • Henschel, H., Kupiainen-Määttä, O., Olenius, T., Kurtén, T., and Vehkamäki, H.: The effect of hydration on particle formation rates in the sulfuric acid/amine system derived from quantum chemistry. NOSA-FAAR Symposium Kuopio, 12–13 March 2015.
  • Kupiainen-Määttä, O.; Henschel, H.: A Simulation-Based Method for Determining Collision and Evaporation Rates from Measured Cluster Distributions. 12th Informal Conference on Atmospheric and Molecular Science, Aarhus, Denmark, June 2015.
  • Kontkanen, J., Olenius, T., Lehtipalo, K., Vehkamäki, H., and Kulmala, M.: Investigating the growth of atmospheric molecular clusters based on appearance times and collision-evaporation fluxes. NOSA-FAAR Symposium Kuopio, 12–13 March 2015.
  • Määttänen, A., Julin, J., Merikanto, J., Ortega, I. K., and Vehkamäki, H.: Improved parameterization for H2SO4 - H2O nucleation. NOSA-FAAR Symposium Kuopio, 12–13 March 2015.
  • Pakarinen, O. H., and Vehkamäki, H.: Modelling heterogeneous nucleation of ice. NOSA-FAAR Symposium Kuopio, 12–13 March 2015.
  • J. Elm: "Optical Properties of Molecular Clusters Consisting of Sulfuric Acid and Bases". European Aerosol Conference, Milan, 6-11 September, 2015.
  • N. Myllys , J. Elm, T. Kurtén, H. Vehkamäki: Modelling atmospheric acid-base clustering using DLPNO-CCSD(T) method. The 1st ORCA user meeting, Wissenschaftspark Gelsenkirchen, Germany, 7.-8.9.2015.
  • T. Ponkkonen, H. Vehkamäki: Amine oxides as cluster forming agents in atmosphere. The 1st ORCA user meeting, Wissenschaftspark Gelsenkirchen, Germany, 7.-8.9.2015 .
  • O. H. Pakarinen, S. Romakkaniemi, A. Virtanen, J. Keskinen and H. Vehkamäki: ICINA project. Academy of Finland ARKTIKO programme seminar, Helsinki, Finland, March 18-19, 2015.
  • R. Halonen, E. Zapadinsky and H. Vehkamäki: Failure of the constrained equilibrium hypothesis in classical nucleation theory. Physics Days 2015, Helsinki, Finland , March 17-19, 2015. 
  • R. Halonen, E. Zapadinsky and H. Vehkamäki: Break of the constrained equilibrium hypothesis. International Aerosol Modeling Algorithms (IAMA) 2015, December 9-11, 2015, Davis, California, USA.  
  • N. T. Tsona, H. Henschel, and H. Vehkamäki: From electronic structure calculations to hydration of clusters containing one bisulphate ion, sulphuric acid and ammonia or dimethylamine. International Congress of Quantum Chemistry, Beijing, China, June 8-13, 2015  
  • N. T. Tsona, H. Henschel, and H. Vehkamäki:  Ab initio calculations of the electrical mobilities of bisulfate ion-sulfuric acid-ammonia/dimethylamineclusters. Physics Days, Helsinki, Finland, March 12-13, 2015

Talks 2014

  • O. H. Pakarinen and H. Vehkamäki: Atomistic modelling of heterogeneous nucleation of ice. FCoE (Finnish Centre of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change) meeting, Helsinki, Finland, November 12-14, 2014.
  • O. H. Pakarinen and H. Vehkamäki: Atomistic modelling of heterogeneous nucleation of ice. CRAICC (Nordic Centre of Excellence) annual meeting, Stockholm, Sweden, October 21-23, 2014. 
  • Hanna Vehkamäki: Uncovering the secrets of atmospheric nanoparticles, The Eleventh Informal Conference on Atmospheric and Molecular Science, 14.8.2014 Helsingør, Denmark
  • Tinja Olenius, Oona Kupiainen-Määttä, and Hanna Vehkamäki: Critical cluster size cannot be determined by slope analysis. IAC (International Aerosol Conference) 2014, Busan, Korea, August 28-September 2, 2014.
  • Oona Kupiainen-Määttä, Tinja Olenius, Theo Kurtén, and Hanna Vehkamäki: Clustering with bases likely enhances sulfuric acid detection by CIMS. IAC (International Aerosol Conference) 2014, Busan, Korea, August 28-September 2, 2014.
  • Henning Henschel, Oona Kupiainen-Määttä, Tinja Olenius, Theo Kurtén, and Hanna Vehkamäki: Modelling of the Humidity Dependence of Particle Formation in the Sulphuric Acid/Amine System. FCoE (Finnish Centre of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change) meeting, Helsinki, Finland, November 12-14, 2014.
  • Henning Henschel, Oona Kupiainen-Määttä, Tinja Olenius, Theo Kurtén, and Hanna Vehkamäki: Modelling of the Effect of Hydration on Particle Formation Rates in the Sulfuric Acid/Amine System. IAC (International Aerosol Conference) 2014, Busan, Korea, August 28-September 2, 2014.
  • Henning Henschel, Narcisse Tsona, Oona Kupiainen-Määttä, Tinja Olenius, Theo Kurtén, and Hanna Vehkamäki: Modeling the Effect of Hydration on Particle Formation Based on Electronic Structure Calculations. 18th Finnish-Estonian Air Ion and Aerosol Workshop, Pühajärve, Estonia, June 2-4, 2014.

Posters 2014

  • Tinja Olenius, Lauri Halonen, Henning Henschel, Oona Kupiainen-Määttä, Theo Kurtén, Kari Lehtinen, and Hanna Vehkamäki: From vapor molecules to atmospheric aerosol particles: insights from the ComQuaCC project. Academy of Finland Annual Seminar of Computational Science Research Programme (Lastu), Helsinki, Finland, December 9, 2014.
  • Tinja Olenius, Ilona Riipinen, Katrianne Lehtipalo, and Hanna Vehkamäki: Growth of small atmospheric clusters: a comparison of growth rates based on cluster appearance times and collision–evaporation fluxes. FCoE (Finnish Centre of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change) meeting, Helsinki, Finland, November 12-14, 2014. 
  • O. H. Pakarinen and H. Vehkamäki: Atomistic modeling of heterogeneous nucleation of ice. Swedish Theoretical Chemistry Meeting, Uppsala, Sweden, October 27-29, 2014.
  • Tinja Olenius, Ilona Riipinen, Katrianne Lehtipalo, and Hanna Vehkamäki: Growth of small molecular clusters: comparison of growth rates determined from cluster appearance times and collision–evaporation fluxes.  AAAR (American Association for Aerosol Research) 33rd Annual Conference, Orlando, Florida, USA, October 20-24, 2014.
  • Henning Henschel, Oona Kupiainen-Määttä, Theo Kurtén, Ville Loukonen, Tinja Olenius, and Hanna Vehkamäki: Sulfuric acid clusters in atmospheric particle formation: insights from computational approaches. ISSPIC-XVII (17th International Symposium on Small Particles and Inorganic Clusters), Fukuoka, Japan, September 7-12, 2014.
  • Henning Henschel, Oona Kupiainen-Määttä, Tinja Olenius, Theo Kurtén, and Hanna Vehkamäki: Modelling of the Humidity Dependence of Particle Formation in the Sulphuric Acid/Amine System. FCoE (Finnish Centre of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change) meeting, Helsinki, Finland, November 12-14, 2014.
  • Olli H. Pakarinen, Hanna Vehkamäki: Atomistic modelling of heterogeneous nucleation of ice. BACG annual meeting, Leeds, UK, July 13-15, 2014.
  • Narcisse Tsona, Nicolai Bork, and Hanna Vehkamäki: Computational studies of the gas phase oxidation of SO2 by some atmospheric ions. Gordon Research Conference, Renaissance Tuscany II Ciocco Resort Lucca (Barga), Italy, April 27 - May 2 2014.
  • Henning Henschel, Ismael K. Ortega, Oona Kupiainen-Määttä, Tinja Olenius, Theo Kurtén, and Hanna Vehkamäki: Modelling of hydration effects on particle formation in the sulfuric acid/amine system. NOSA Aerosol Symposium 2014, Stockholm, Sweden, January 30-31, 2014.
  • O. Kupiainen-Määttä, T. Olenius and H. Vehkamäki: Critical cluster size cannot be solved by slope analysis, NOSA Aerosol Symposium 2014, Stockholm, Sweden, January 30-31, 2014.
  • K. Ruusuvuori, P. Hietala, O. Kupiainen, T. Kurtén and H. Vehkamäki: The charging of amine containing clusters using protonated acetone. NOSA Aerosol Symposium 2014, Stockholm, Sweden, January 30-31, 2014.
  • T. Kurtén, M. Ehn, O. Kupiainen, T. Olenius, M. Rissanen, J. A. Thornton, L. Nielsen, S. Jørgensen, I. K. Ortega Colomer, H. G. Kjaergaard, and H. Vehkamäki: Sulfuric acid and organic vapors in atmospheric new-particle formation. NOSA Aerosol Symposium 2014, Stockholm, Sweden, January 30-31, 2014. 

Talks 2013

  • Hanna Vehkamäki: Uncovering the secrets of atmospheric nanoparticles. Laboratoire de meteorologie  (LMD), Universite Pierre et Marie Curie, Paris, France, 24.10.2013.
  • Hanna Vehkamäki: Uncovering the secrets of atmospheric nanoparticles. Laboratoire atmospheres, milieux, observations spatiales (LATMOS), Universite Versailles Saint Quentin, Paris, France, 22.10.2013
  • Hanna Vehkamäki, Nicolai Bork, Henning Henschel, Oona Kupiainen- Määttä, Theo Kurten, Ville Loukonen, Tinja Olenius, Ismael Ortega, Kai Ruusuvuori, and Narcisse Tsona Tchinda: University of Helsinki Computational aerosol physics group activities in 2011-2013, Academy of Finland Center of Excellence ’Finnish Center of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change’ Final Meeting, 23-25.9.2013 Lapland, Finland.
  • Henning Henschel, Ismael K. Ortega, Oona Kupiainen, Tinja Olenius, Theo Kurtén, and Hanna Vehkamäki: Hydration of Sulfuric Acid Clusters and the Impact of Bases. The 2013 European Aerosol Conference, Prague, Czech Republic, September 1-6, 2013.
  • Tinja Olenius, Oona Kupiainen-Määttä, Ismael K. Ortega, Theo Kurtén, and Hanna Vehkamäki: Free energy barrier in the growth of sulfuric acid clusters. The 2013 European Aerosol Conference, Prague, Czech Republic, September 1-6, 2013.
  • Tinja Olenius, Siegfried Schobesberger, Oona Kupiainen, Alessandro Franchin, Heikki Junninen, Ismael K. Ortega, Theo Kurtén, Ville Loukonen, Douglas R. Worsnop, Markku Kulmala, and Hanna Vehkamäki: Comparing simulated and experimental molecular cluster distributions. Faraday Discussion 165, Leeds, UK, July 22-24, 2013.
  • Oona Kupiainen, Tinja Olenius and Hanna Vehkamäki: Experimental Setup Aects The Particle Formation Rate And Its Slope d(log J)/d(log C). 19th International Conference on Nucleation & Atmospheric Aerosols, Fort Collins, Colorado, USA, June 24-28, 2013.
  • Theo Kurtén, Ismael K. Ortega, Oona Kupiainen, Tinja Olenius, Ville Loukonen, Heidi Reiman, Matthew J. McGrath and Hanna Vehkamäki,Formation rates, stability and reactivity of sulfuric acid – amine clusters predicted by computational chemistry. European Geosciences Union (EGU) General Assembly, 7-12.4.2013.
  • Narcisse Tsona, Nicolai Bork and Hanna Vehkamäki: From Gas-Phase Oxidation of SO2 by SO4- to the Formation of Sulfuric Acid. 19th International Conference on Nucleation & Atmospheric Aerosols, Fort Collins, Colorado, USA, June 24-28, 2013.
  • Ville Loukonen, Nicolai Bork, and Hanna Vehkamäki: First-principles molecular dynamics simulations of (sulfuric acid)1(dimethylamine)1 cluster formation, 19th International Conference on Nucleation & Atmospheric Aerosols, Fort Collins, Colorado, USA, June 24-28, 2013.

Posters 2013

  • Henning Henschel, Ismael K. Ortega, Oona Kupiainen, Tinja Olenius, Theo Kurtén, and Hanna Vehkamäki: Hydration of Pure and Basecontaining Sulfuric Acid Clusters Studied by Computational Chemistry Methods. 19th International Conference on Nucleation & Atmospheric Aerosols, Fort Collins, Colorado, USA, June 24-28, 2013.
  • Tinja Olenius, Oona Kupiainen, Ismael K. Ortega, Theo Kurtén, and Hanna Vehkamäki: Is There an Energy Barrier in the Growth of Sulfuric Acid Clusters? 19th International Conference on Nucleation & Atmospheric Aerosols, Fort Collins, Colorado, USA, June 24-28, 2013. 
  • Kai Ruusuvuori, Paula Hietala, Oona Kupiainen, Theo Kurtén and Hanna Vehkamäki: The Charging Properties Of Protonated Acetone And Acetone Clusters, 19th International Conference on Nucleation & Atmospheric Aerosols, Fort Collings, Colorado, USA, June 24-28, 2013.
  • Kai Ruusuvuori, Paula Hietala, Oona Kupiainen, Theo Kurtén and Hanna Vehkamäki: The Charging of Amine Containing Clusters Using Protonated Acetone, 9th European Conference on Computational Chemistry, September 1-5, Sopron, Hungary, June 24-28, 2013.

Talks 2012

  • Hanna Vehkamäki: Overview of molecular modelling of atmospheric particle formation. Academy of Finland Center of Excellence ’Finnish Center of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Cli- mate Change’ Annual Meeting, 19.-21.9.2012, Hyytiälä, Finland
  • Oona Kupiainen, Tinja Olenius, Ismael K. Ortega, Theo Kurtén and Hanna Vehkamäki: Ion-induced vs. base-induced sulfuric acid cluster formation. FCoE (Finnish Centre of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change) meeting, Hyytiälä Forestry Station, September 19-21, 2012.
  • Theo Kurtén, Ismael K. Ortega, Oona Kupiainen, Tinja Olenius, Ville Loukonen, Heidi Reiman, Matthew J. McGrath, Hanna Vehkamäki, Computational chemistry of sulfuric acid – amine clusters, Atmospheric Chemical Mechanisms conference, Davis, CA, USA, 10-12.12.2012.
  • Theo Kurtén, Hanna Vehkamäki: Modelling cluster evaporation in instruments. Some failed approaches. 3rd NICITA workshop in Pühajärve, Estonia, 25.-27.4.2012.
  • Theo Kurtén, Ismael K. Ortega, Oona Kupiainen, Tinja Olenius, Ville Loukonen and Hanna Vehkamäki: Lewis bases as the unifying concept for ion-induced and neutral H2SO4 nucleation. Presentation at the  European Aerosol Conference 2012, Granada, Spain, 2.9-7.9.2012.
  • Theo Kurtén: Chemical insights into cluster formation. Invited presentation (as an external expert) at the CLOUD ITN open conference in Königstein, Germany, 22.05.2012 - 24.05.2012.
  • Theo Kurtén: Computational Chemistry of Condensing Vapors. Invited presentation at the University of Copenhagen, Denmark, 25.05.2012.
  • Tinja Olenius, Oona Kupiainen, Ismael K. Ortega, and Hanna Vehkamäki: Clustering pathways of sulfuric acid, ammonia and dimethylamine molecules. NOSA (Nordic Society for Aerosol Research) Aerosol Symposium 2012, Helsingør, Denmark, 15-16 November, 2012. 
  • Hanna Vehkamäki: Investigating Atmospheric Particle Formation with the Atmospheric Cluster Dynamics Code, seminar presentation at University of Minnesota, USA, 1.3.2012
  • Hanna Vehkamäki: Uncovering the formation mechanism of atmospheric nanoparticles, American Physical Society March meeting, Boston, USA, 27.2.2012. Invited presentation.
  • Ville Loukonen: Modelling the Formation of Atmospheric Aerosol Particles: emphasis on the very initial steps: 10th Modelling seminar (Kymmenes mallinnusseminaari), Helsinki, Finland, 02-03.02.2012.
  • Ville Loukonen, I-Feng W. Kuo, Matthew J. McGrath, and Hanna Vehkamäki: On the Stability and Dynamics of Atmospheric Pre-Nucleation Clusters, American Physical Society March meeting, Boston, USA, 27.02. - 02.03.2012.
  • Ville Loukonen, I-Feng W. Kuo, Matthew J. McGrath, and Hanna Vehkamäki: First-Principles Molecular Dynamics Simulations of (sulfuric acid)(ammonia/dimethylamine) Clusters, AAAR (American Association for Aerosol Research) 31st Annual Conference, Minneapolis, USA, 08. - 12.10.2012.
  • Ismael K. Ortega, Oona Kupiainen, Tinja Olenius, Matthew J. McGrath, Theo Kurtén, Ville Loukonen, Markku Kulmala, and Hanna Vehkamäki: Dimethylamine-Sulfuric Acid Clustering Can Explain Observed Atmospheric New-Particle Formation, AAAR (American Association for Aerosol Research) 31st Annual Conference, Minneapolis, USA, 08. - 12.10.2012.
  • Ville Loukonen, I-Feng W. Kuo, M. J. McGrath, and Hanna Vehkamäki: On the Stability and Dynamics of (sulfuric acid)(ammonia/dimethylamine) Clusters , Workshop on Atmospheric Aerosol Formation and Early Growth, Hyytiälä Forestry Station, August 20-22, 2012.

Posters 2012

  • Oona Kupiainen, Tinja Olenius, Ismael K. Ortega, Theo Kurtén and Hanna Vehkamäki: Ion-induced vs. base-induced sulfuric acid nucleation. European Aerosol Conference, Granada, September 2-7, 2012.
  • Oona Kupiainen, Tinja Olenius, Ismael K. Ortega and Hanna Vehkamäki: Simulating cluster formation in CLOUD. Workshop on Atmospheric Aerosol Formation and Early Growth, Hyytiälä Forestry Station, August 20-22, 2012.
  • Narcisse Tsona, Nicolai Bork and Hanna Vehkamäki: Oxidation of SO2 by O2 -(H2O)n clusters in the Gas-Phase - a Density Functional Theory Study. European Aerosol Conference 2012, Granada, Spain, 2.9-7.9.2012.
  • Narcisse Tsona, Nicolai Bork and Hanna Vehkamäki: Structures and Thermodynamics of the Gas-Phase Reaction between SO2 and O2 -(H2O)0-5 Clusters. NOSA Symposium, Helsingor, Denmark, 15.11-16.11.2012.
  • Tinja Olenius, Oona Kupiainen, Ismael K. Ortega, Theo Kurtén, Siegfried Schobesberger, and Hanna Vehkamäki: Comparing simulated and experimental molecular cluster distributions. European Aerosol Conference, Granada, September 2-7, 2012.
  • Tinja Olenius, Oona Kupiainen, Ismael K. Ortega, and Hanna Vehkamäki: Clustering pathways of sulfuric acid, ammonia and dimethylamine molecules. Workshop on Atmospheric Aerosol Formation and Early Growth, Hyytiälä Forestry Station, August 20-22, 2012.
  • Ville Loukonen, I-Feng W. Kuo, M. J. McGrath, and Hanna Vehkamäki: Ab initio molecular dynamics study of sulfuric acid clusters with ammonia/dimethylamine. European Aerosol Conference 2012, Granada, Spain, 2.9-7.9.2012.
  • Ville Loukonen, I-Feng W. Kuo, M. J. McGrath, and Hanna Vehkamäki: Electric dipole moments of atmospheric pre-nucleation clusters. FCoE (Finnish Centre of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change) meeting, Hyytiälä Forestry Station, September 19-21, 2012.
  • Kai Ruusuvuori, Theo Kurtén, Ismael K. Ortega and Hanna Vehkamäki: Determining the Proton Affinity of Atmospheric Ions, AAAR (American Association for Aerosol Research) 31st Annual Conference, Minneapolis, USA, 08. - 12.10.2012.
  • Kai Ruusuvuori, Theo Kurtén, Ismael K. Ortega and Hanna Vehkamäki: Determining the Proton Affinity of Atmospheric Ions, European Aerosol Conference 2012, Granada, Spain, 2.9-7.9.2012.  

Talks 2011

  • Hanna Vehkamäki: ’Investigating Atmospheric Particle Formation with Molecular Modelling Methods’ International Aerosol Modeling Algorithms (IAMA Conference) UC Davis Conference Center, USA, 30.11.2011. Invited presentation.
  • Hanna Vehkamäki: Uncovering the secrets of atmospheric nanoparticles. 6th Nordic Women in Physics Workshop, Copenhagen, Denmark 30.9.2011. Invited presentation.
  • Hanna Vehkamäki, Matthew J. McGrath, Theo Kurten, Kari Lehtinen, Markku Kulmala Rethinking the first nucleation theorem in atmospheric nucleation. The 2011 European Aerosol Conference, September 4-9, 2011.
  • Oona Kupiainen, Ismael K. Ortega, Theo Kurtén and Hanna Vehkamäki: Amine substitution into sulfuric acid - ammonia clusters, 10th Informal Conference on Atmospheric and Molecular Science, June 9.-10., 2011.
  • Hanna Vehkamäki, Matthew J. McGrath, Jan Julin, Theo Kurten, Kari E. J. Lehtinen and Markku Kulmala: Rethinking the first nucleation theorem in atmospheric nucleation„ 85th ACS Colloid and Surface Science Symposium, June 19-22, 2011. Presented by Jan Julin.
  • Ismo Napari, Jan Julin and Hanna Vehkamäki: Performance of some nucleation theories with a non-sharp droplet-vapor interface, 85th ACS Colloid and Surface Science Symposium, June 19-22, 2011. Presented by Jan Julin.
  • Oona Kupiainen, Tinja Olenius, Ismael K. Ortega, Theo Kurtén and Hanna Vehkamäki: Ammonia and amines in sulfuric acid clusters,. NOSA & FAAR Aerosol Symposium 2011, November 9-11, 2011. 
  • Ismael K. Ortega, Matthew J. McGrath, Oona Kupiainen, Tinja Olenius, , Theo Kurtén, Markku Kulmala and Hanna Vehkamäki: ACDC model: a highway to nucleation. NOSA & FAAR Aerosol Symposium 2011, November 9-11, 2011
  • Ismael K. Ortega, Oona Kupiainen, Tinja Olenius, Matthew J. McGrath, Theo Kurtén,P. Paasonen, S. Schobesberger, Markku Kulmala and Hanna Vehkamäki: Formation of sulfuric acid clusters containing base molecules. The 2011 European Aerosol Conference,September 4-9, 2011. 
  • Theo Kurtén, Matt McGrath, Ismael K. Ortega, Oona Kupiainen, Ville Loukonen, Hanna Vehkamäki: Using computational chemistry to calculate cluster evaporation rates. CLOUD open workshop, February 16-18, 2011.  Ismael K. Ortega, Oona Kupiainen, Tinja Olenius, Matthew J. McGrath, Theo Kurtén, Markku Kulmala and Hanna Vehkamäki: Comparing CLOUD results with quantum chemistry based cluster dynamic model ACDC, CLOUD data workshop, September 28-29, 2011. 
  • I. K. Ortega, M. J. McGrath, J. Leppä, P. Paasonen, T. Olenius, K. E. J. Lehtinen, V.-M. Kerminen,M. Kulmala and H. Vehkamäki: Simulating Atmospheric Ion Nucleation From the Nano to the Micro Scale,. LASTU seminar (Academy of Finland), April 6-8, 2011. Presented by I.K. Ortega and J. Leppä.
  • I.K. Ortega, T. Kurtén, O. Kupiainen, M.J. McGrath, T. Olenius, M. Kulmala and H. Vehkamäki: The use of computational chemistry in modeling the chemistry and physics of atmospheric nucleation and nucleation precursor gases, FCOE meeting, May 18-20, 2011. 
  • I.K. Ortega, O. Kupiainen, M. McGrath, T. Olenius, T. Kurten, M. Kulmala, H. Vehkamäki: Combining quantum chemical calculations with cluster dynamics models to understand ion induced nucleation. Joint 2nd NICITA workshop and 15th Finnish- Estonian air ion and atmospheric aerosol workshop, Hyytiälä, 23.-25.5.2011. 

Posters 2011

  • Kai Ruusuvuori, Theo Kurtén, Matthew J. McGrath, Ismael K. Ortega, Hanna Vehkamäki and Markku Kulmala: Stability of Clusters Containing Water, Pyridine and Ammonia, 10th Informal Conference on Atmospheric and Molecular Science, June 9.-10., 2011.
  • Guram Chkonia, Jan Julin, Judith Wölk, Ismo Napari, Hanna Vehkamäki and Reinhard Strey: Nanoscopic heterogeneous nucleation events on curved surfaces. 85th ACS Colloid and Surface Science Symposium, June 19-22, 2011.
  • Kai Ruusuvuori, Theo Kurtén, Matthew J. McGrath, Ismael K. Ortega, Hanna Vehkamäki and Markku Kulmala: Stability of Clusters Containing Water, Pyridine and Ammonia,. European Seminar on Computational Methods in Quantum Chemistry, June 16.-19., 2011. 
  • Kai Ruusuvuori, Theo Kurtén, Matthew J. McGrath, Ismael K. Ortega, Hanna Vehkamäki and Markku Kulmala: Stability of Clusters Containing Water, Pyridine and Ammonia. Finnish Center of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change Annual Workshop, May 18-20, 2011. 
  • Ville Loukonen, I-Feng W.Kuo, Matthew J.McGrath and Hanna Vehkamäki: On the Stability and Dynamics of Pre-Nucleation Clusters, NOSA & FAAR Aerosol Symposium 2011, November 9-11, 2011. 
  • Theo Kurtén, Ismael K. Ortega, Oona Kupiainen, Tinja Olenius, Ville Loukonen and Hanna Vehkamäki: Lewis bases as the unifying concept for ion-induced and neutral H2SO4 nucleation, NOSA & FAAR Aerosol Symposium 2011, November 9-11, 2011. 
  • Tinja Olenius, Ismael K. Ortega, Oona Kupiainen, Matthew J. McGrath, Theo Kurtén, Markku Kulmala and Hanna Vehkamäki: Modeling distributions of molecular clusters relevant to CLOUD experiment. NOSA & FAAR Aerosol Symposium 2011, November 9-11, 2011.
  • Kai Ruusuvuori, Theo Kurtén, Matthew J. McGrath, Ismael K. Ortega and Hanna Vehkamäki: Stability of Clusters Containing Water, Pyridine and Ammonia. NOSA & FAAR Aerosol Symposium 2011, November 9-11, 2011. 
  • Ville Loukonen and Hanna Vehkamäki: Contact angle, seed particle radius and the onset of heterogeneous nucleation.  The 2011 European Aerosol Conference, September 4-9, 2011.
  • M. J. McGrath, I. K. Ortega, P. Paasonen, T. Olenius , K. E. J. Lehtinen, M. Kulmala, and H. Vehkamäki: Simulation of Small Ion Aerosol Dynamics. The 2011 European Aerosol Conference, September 4-9, 2011. 
  • Oona Kupiainen, Ismael K. Ortega, Pauli Paasonen, Ville Loukonen, , Hanna Vehkamäki and Markku Kulmala: Ammonia and amines in atmospheric particle formation. Physics Days 2011, March 29-31, 2011. 
  • Ismael K. Ortega, Theo Kurtén, Oona Kupiainen, Hanna Vehkamäki and Markku Kulmala: Using quantum mechanics to improve our knowledge about climate change,. Physics Days 2011, March 29-31, 2011. 
  • Oona Kupiainen, Ismael K. Ortega, Pauli Paasonen, Ville Loukonen, Theo Kurtén, Hanna Vehkamäki and Markku Kulmala: Ammonia and amines in atmospheric particle formation. LASTU seminar (Academy of Finland), April 6-8, 2011. 
  • Oona Kupiainen, Ismael K. Ortega, Pauli Paasonen, Ville Loukonen, Theo Kurtén, Hanna Vehkamäki and Markku Kulmala: Ammonia and amines in atmospheric particle formation,. LASTU seminar (Academy of Finland), April 6-8, 2011. 

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