1. Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
2. California Institute of Technology, Division of Chemistry and Chemical Engineering 210-41, Pasadena, CA 91125, USA
3. Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, 00014 Helsinki, Finland
4. Finnish Meteorological Institute, FI-00560 Helsinki, Finland
5. Institute for Materials Chemistry, TU Wien, 1060 Vienna, Austria
6. CERN, CH-1211 Geneva, Switzerland
7. Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt, 60438 Frankfurt am Main, Germany
8. Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
9. Atmospheric Processes and Their Impact, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
10. CENTRA, FCUL, University of Lisbon, 1749-016 Lisbon, Portugal
11. Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
12. Helsinki Institute of Physics (HIP)/Physics, Faculty of Science, University of Helsinki, 00014 Helsinki, Finland
13. Department of Chemistry, CIRES, University of Colorado Boulder, 215 UCB, Boulder, 80309, CO, USA
14. Institute of Ion Physics and Applied Physics, University of Innsbruck, 6020 Innsbruck, Austria
15. Lebedev Physical Institute of the Russian Academy of Sciences, 119991, Leninsky prospekt, 53, Moscow, Russian Federation
16. IDL-Universidade da Beira Interior, 6201-001 Covilhã, Portugal
17. Aerosol Physics Laboratory, Physics Unit, Tampere University, FI-33014 Tampere, Finland
18. Aerodyne Research, 01821 Billerica, MA, USA
19. Center for Atmospheric Particle Studies, Carnegie Mellon University, 1521 Pittsburgh, PA, USA