1. Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
2. Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan
3. Institute of Atomic and Molecular Sciences, Academia Sinica, P. O. Box 23-166, Taipei 10617, Taiwan
4. Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
5. Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi 62102, Taiwan