1. NASA Langley Research Center; Hampton Virginia USA
2. NASA Postdoctoral Program; NASA Langley Research Center; Hampton Virginia USA
3. Institute of Arctic and Alpine Research; University of Colorado Boulder; Boulder Colorado USA
4. National Center for Atmospheric Research; Boulder Colorado USA
5. Institute of Ion Physics and Applied Physics; University of Innsbruck; Innsbruck Austria
6. Department of Chemistry; University of Oslo; Oslo Norway
7. Department of Chemistry; University of California; Irvine California USA
8. US Environmental Protection Agency; Denver Colorado USA