1. Quantum Chemical Physics Division, Graduate School of Science, Yokohama-City University, Seto 22-2, Kanazawa-ku, Yokohama 236-0027, and PRESTO, Japan Science and Technology Agency (JST), Tokyo, Japan, and Center for Promotion of Computational Science and Engineering, Japan Atomic Energy Research Institute (JAERI), Higashi-Ueno 6-9-3, Taito-ku, Tokyo 110-0015, Japan