1. NOAA Chemical Sciences Laboratory (CSL), Boulder, Colorado 80305, United States
2. Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, Colorado 80309, United States
3. Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309-0215, United States
4. NASA Langley Research Center, MS 483, Hampton, Virginia 23681, United States
5. Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, Colorado 80301, United States
6. Department of Atmospheric Sciences, University of Washington, Seattle, Washington 98195, United States
7. Air Quality Research Division (AQRD), Environment and Climate Change Canada, Toronto M3H 5T4, Ontario, Canada
8. Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, Florida 32304, United States
9. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
10. Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado 80523, United States
11. Science Systems and Applications, Inc. (SSAI), Hampton, Virginia 23666, United States
12. Institute for Ion Physics and Applied Physics, University of Innsbruck, Innsbruck 6020, Austria
13. Department of Chemistry, University of Oslo, Oslo 0315, Norway
14. Graduate School of Nanobioscience, Yokohama City University, Yokohama 236-0027, Kanagawa, Japan