1. Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
2. Department
of Physics, National Taiwan Normal University, Taipei 106, Taiwan
3. Graduate Institute of Applied Physics, National Chengchi University, Taipei 116, Taiwan
4. Center for General Education and Department of Physics, National Taiwan Normal University, Taipei 106, Taiwan
5. National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
6. Department of Mechanical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
7. Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 10608, Taiwan