On the composition of ammonia–sulfuric-acid ion clusters during aerosol particle formation
- Schobesberger, S. (Department of Physics, University of Helsinki)
- Franchin, A. (Department of Physics, University of Helsinki)
- Amorim, A. (SIM, University of Lisbon and University of Beira Interior)
- Dommen, J. (Laboratory of Atmospheric Chemistry, Paul Scherrer Institute)
- Dunne, E. M. (School of Earth and Environment, University of Leeds)
- Ehn, M. (Department of Physics, University of Helsinki)
- Gagné, S. (Department of Physics, University of Helsinki)
- Ickes, L. (Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt)
- Junninen, H. (Department of Physics, University of Helsinki)
- Hansel, A. (Ionicon Analytik GmbH)
- Kerminen, V.-M. (Department of Physics, University of Helsinki)
- Kirkby, J. (Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt)
- Bianchi, F. (Laboratory of Atmospheric Chemistry, Paul Scherrer Institute)
- Kupc, A. (Faculty of Physics, Faculty of Physics, University of Vienna)
- Laaksonen, A. (Finnish Meteorological Institute)
- Lehtipalo, K. (Department of Physics, University of Helsinki)
- Mathot, S. (CERN)
- Onnela, A. (CERN)
- Petäjä, T. (Department of Physics, University of Helsinki)
- Riccobono, F. (Laboratory of Atmospheric Chemistry, Paul Scherrer Institute)
- Santos, F. D. (SIM, University of Lisbon and University of Beira Interior)
- Sipilä, M. (Department of Physics, University of Helsinki)
- Tomé, A. (SIM, University of Lisbon and University of Beira Interior)
- Rondo, L. (Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt)
- Tsagkogeorgas, G. (Leibniz Institute for Tropospheric Research)
- Viisanen, Y. (Finnish Meteorological Institute)
- Wagner, P. E. (Faculty of Physics, Faculty of Physics, University of Vienna)
- Wimmer, D. (Department of Physics, University of Helsinki)
- Curtius, J. (Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt)
- Donahue, N. M. (Center for Atmospheric Particle Studies, Carnegie Mellon University)
- Baltensperger, U. (Laboratory of Atmospheric Chemistry, Paul Scherrer Institute)
- Kulmala, M. (Department of Physics, University of Helsinki)
- Worsnop, D. R. (Department of Physics, University of Helsinki)
- Duplissy, J. (Department of Physics, University of Helsinki)
- Kürten, A. (Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt)
- Ortega, I. K. (Department of Physics, University of Helsinki)
- Metzger, A. (Ionicon Analytik GmbH)
- Schnitzhofer, R. (Institute for Ion and Applied Physics, University of Innsbruck)
- Almeida, J. (CERN)
DOIAbstract
The formation of particles from precursor vapors is an important source of atmospheric aerosol. Research at the Cosmics Leaving OUtdoor Droplets (CLOUD) facility at CERN tries to elucidate which vapors are responsible for this new-particle formation, and how in detail it proceeds. Initial measurement campaigns at the CLOUD stainless-steel aerosol chamber focused on investigating particle formation from ammonia (NH3) and sulfuric acid (H2SO4). Experiments were conducted in the presence of water, ozone and sulfur dioxide. Contaminant trace gases were suppressed at the technological limit. For this study, we mapped out the compositions of small NH3–H2SO4 clusters over a wide range of atmospherically relevant environmental conditions. We covere...
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