Affiliation: | 1. Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6 (Canada) http://www.chem.utoronto.ca/staff/DSTEPHAN;2. Mulliken Center for Theoretical Chemistry, Institut für Physikalische und Theoretische Chemie, Universit?t Bonn, Beringstrasse 4, 53115 Bonn (Germany) |