1. Molecular Science and Technology Program, Taiwan International Graduate Program, Academia Sinica, Taipei106, Taiwan
2. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei115, Taiwan
3. Department of Physics, National Central University, Chung-Li320, Taiwan
4. Department of Physics, National Taiwan University, Taipei106, Taiwan
5. Department of Chemistry, National Taiwan University, Taipei106, Taiwan
6. Nano Science and Technology Program, Taiwan International Graduate Program, Academia Sinica, Taipei106, Taiwan
7. Institute of Physics, Academia Sinica, Taipei106, Taiwan
8. Advanced Research Centre for Green Materials Science and Technology, National Taiwan University, Taipei106, Taiwan