1. Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan
2. Atomic, Molecular, and Optical Physics Laboratory, RIKEN, Saitama 351-0198, Japan
3. Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
4. Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, A-6020 Innsbruck, Austria
5. Department of Computer Science, University of Southern California, Los Angeles, California 90089, United States
6. Department of Chemistry, School of Science, Kitasato University, Sagamihara, Kanagawa 252-0373, Japan
7. Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan