1. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617, Taiwan
2. International Graduate Program of Molecular Science and Technology, National Taiwan University, Taipei, 10617, Taiwan
3. Molecular Science and Technology Program, Taiwan International Graduate Program, Academia Sinica, Taipei 10617, Taiwan
4. Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
5. Department of Physics, National Central University, Taoyuan 320, Taiwan