1. Pacific Northwest National Laboratory Richland Washington USA
2. Department of Chemistry and Biochemistry and Department of Atmospheric and Oceanic Sciences University of Colorado Boulder Boulder Colorado USA
3. National Center for Atmospheric Research Boulder Colorado USA
4. National Severe Storms Laboratory Norman Oklahoma USA
5. NASA Langley Research Center Hampton Virginia USA
6. Oak Ridge Associated Universities Oak Ridge Tennessee USA
7. Institute of Ion Physics and Applied Physics University of Innsbruck Innsbruck Austria