1. Department of Chemistry and Biochemistry; South Dakota State University; Brookings South Dakota USA
2. Laboratoire de Glaciologie et Géophysique de l'Environnement; CNRS/Université Joseph Fourier-Grenoble 1; Saint Martin d'Hères France
3. Department of Chemistry and Biochemistry; University of California, San Diego; La Jolla California USA
4. Desert Research Institute; Nevada System of Higher Education; Reno Nevada USA