1. Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
2. Department of Chemistry, University of California Irvine, Irvine, California 92697, United States
3. Institute of Energy & Climate Research, IEK-8: Troposphere, Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
4. Institute for Environmental Research & Sustainable Development, National Observatory of Athens, 15236 Palea Penteli, Greece
5. Dept. of Physics, Portland State University, Portland, Oregon 97201, United States
6. Department of Ecology and Evolutionary Biology, University of California Irvine, Irvine, California 92697, United States
7. Atmospheric Chemistry Department, Max Planck Institute for Chemistry, 55128 Mainz, Germany
8. Climate and Atmosphere Research Center, The Cyprus Institute, 1645 Nicosia, Cyprus