1. Department of Physics, University of Science and Technology of China, Hefei
230026, China
2. Department
of Chemistry, University of Victoria, P.O.
Box 3065, Victoria, British
Columbia, Canada V8W 3V6
3. Department of Biochemistry and
Microbiology, University of Victoria, P.O.
Box 3055, Victoria, British Columbia, Canada V8W 3P6