1. Institute of Chemistry, Chinese Academy of Science, Beijing 100190, People’s Republic of China, Department of Physics, Engineering Physics and Optics & Center for Optics, Photonics and Laser (COPL), Université Laval, Québec City, Québec, G1 V 0A6, Canada, Institute of Atomic and Molecular Science, Academia Sinica, P.O. Box 23-166, Taipei, Taiwan, Republic of China, and Institute of Applied Chemistry, Institute of Molecular Science, Chiao-Tung University, Hsin-Chu, Taiwan, Republic of China