1. Institute for Lasers, Photonics, and Biophotonics Department of Chemistry University at Buffalo State University of New York Buffalo NY 14260 USA
2. Physics Department Universidade Federal of Pernambuco Recife PE 50670‐901 Brazil
3. Department of Physical and Quantum Chemistry Wroclaw University of Science and Technology Wyb. Wyspiańskiego 27 PL‐50370 Wrocław Poland
4. Department of General and Inorganic Chemistry National Research Tomsk Polytechnic University 30 Lenin Avenue Tomsk 634050 Russia
5. Department of Theoretical Chemistry and Biology Royal Institute of Technology S‐10691 Stockholm Sweden
6. Air Force Research Laboratory Wright‐Patterson Air Force Base Dayton OH 45433 USA