1. Department of Chemistry, Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739−8526, and Computing and Communication Center, Kyushu University, Fukuoka 812-8581, Japan
2. Computing and Communication Center, Kyushu University, Fukuoka 812-8581, Japan
3. National Institution for Academic Degrees and University Evaluation, Tokyo 187-8587, Japan