1. Research Centre for Spectrochemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo‐ku, Tokyo 113‐0033, Japan
2. Department of Chemistry, College of Humanities and Sciences, Nihon University, Sakurajosui, Setagaya‐ku, Tokyo 156‐8550, Japan, Fax: +81‐3‐5317‐9433
3. Department of Applied Physics, Nagoya University, Nagoya 464‐8603, Japan
4. Research Institute for Computational Sciences (RICS), National Institute of Advanced Industrial Science and Technology (AIST), 1‐1‐1 Umezono, Tsukuba, Ibaraki 305‐8568, Japan
5. Research Centre for Integrated Science (RCIS), Japan Advanced Institute of Science and Technology (JAIST), 1‐1 Asahidai, Nomi, Ishikawa 923‐1292, Japan