1. Department of Chemistry, National Cheng Kung University 1, Ta Hsueh Road, Tainan, Taiwan, Repubic of China
2. National Synchrotron Radiation Research Center 101, Hsin-Ann Road, Hsinchu, Taiwan, Repubic of China
3. Institute of Atomic and Molecular Sciences Academia, Sinica P.O. Box 23-166, Taipei, Taiwan, Repubic of China