1. Air Force Research
Laboratory, Space Vehicles Directorate, Kirtland
Air Force Base, New Mexico 87117-57776, United States
2. Department
of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
3. Max-Planck-Institut für Biophysikalische Chemie, Am Fassberg 11, D-37077 Göttingen, Germany
4. Institut
für Physikalische Chemie, Universität Göttingen, Tammannstrasse
6, D-37077 Göttingen, Germany