1. Department of Chemistry, Wilfrid Laurier University, Waterloo, Ontario, Canada N2L 3C5
2. Institute for Physical Chemistry, University of Goettingen, Tammannstrasse 6, D-37077 Goettingen, Germany
3. Air Force Research Laboratory, Space Vehicles Directorate, 29 Randolph Road, Hanscom AFB, Massachusetts 017310-3010
4. Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1