1. Department of Applied Chemistry, Institute of Molecular Science and Center for Interdisciplinary Molecular Science, National Chiao‐Tung University, Hsinchu 30010, Taiwan
2. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan
3. Institute of Physics, National Chiao‐Tung University, Hsinchu 30010, Taiwan
4. Physics Division, National Center for Theoretical Sciences„ Hsinchu 30010, Taiwan
5. Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980–8578, Japan