1. Laboratory of Atmospheric Chemistry; Paul Scherrer Institute; Villigen Switzerland
2. Now at National Research Council Canada; Ottawa Canada
3. Joint Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute of Chemistry; University of Rostock; Rostock Germany
4. Now at Alfred Wegener Institute; Bremerhaven Germany
5. Joint Mass Spectrometry Centre, Cooperation Group Comprehensive Molecular Analytics; Helmholtz Zentrum München; Neuherberg Germany
6. Helmholtz Virtual Institute for Complex Molecular Systems in Environmental Health; Neuherberg Germany
7. Department of Physics; University of Genoa; Genova Italy
8. INFN, Sezione di Genova; Genova Italy
9. Institute for Atmospheric and Climate Science; ETH Zurich; Zurich Switzerland
10. Department of Piston Machines and Internal Combustion Engines; University of Rostock; Rostock Germany
11. Aerosol d.o.o.; Ljubljana Slovenia
12. Now at Condensed Matter Physics Department; Jožef Stefan Institute; Ljubljana Slovenia