1. Department of Chemistry, University of Idaho, P.O. Box 442343, Moscow, ID 83844‐2343 (USA), Fax: (+1) 208‐885‐6173
2. Department of Chemistry, Kurukshetra University, Kurukshetra 136119 (India)
3. Department of Physics, University of Idaho, P. O. Box 440903, Moscow, ID 83844‐0903 (USA)
4. Environmental Biotechnology Institute, University of Idaho, P. O. Box 441052, Moscow, ID 83844‐1052 (USA)