1. Chemical Sciences Division, Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder CO USA
2. Cooperative Institute for Research in Environmental Science; University of Colorado; Boulder CO USA
3. Department of Chemistry; University of Colorado; Boulder CO USA
4. Department of Atmospheric Sciences; University of Washington; Seattle WA USA
5. Department of Physics; North Carolina A&T State University; Greensboro NC USA
6. Department of Chemistry; University of California; Berkeley CA USA
7. Department of Earth and Planetary Science; University of California; Berkeley CA USA
8. Atompheric Chemistry Observations & Modeling Laboratory; National Center for Atmospheric Research
9. Deparment of Chemistry; University of California; Irvine CA
10. NASA Langley Research Center; Hampton VA
11. NASA Goddard Space Flight Center; Greenbelt MD