1. Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
2. School of Chemistry and Chemical
Engineering, Sun Yat-sen University, Guangzhou,
510275, China
3. Department
of Physics, Pukyong National University, Busan 608-737, Korea
4. Department of Physics, National Taiwan University, Taipei 106, Taiwan
5. Research
Center for Applied Science, Academia Sinica, Taipei 115, Taiwan