1. Department
of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588-0299, United States
2. Department
of Theoretical Chemistry, Faculty of Chemistry, Jagiellonian University, 30-060 Krakow, Poland
3. Department
of Physics, California State University at San Bernardino, San Bernardino, California 92407, United States
4. Nebraska
Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588-0298, United States
5. Department
of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, United States