1. Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
2. Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
3. Atomic, Molecular, and Optical Physics Laboratory, RIKEN, Saitama 351-0198, Japan
4. Department of Physics and Astronomy, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada