1. Department of Physics, Tamkang University, New Taipei City 251301, Taiwan
2. Department of Applied Physics, National University of Kaohsiung, Kaohsiung 811726, Taiwan
3. Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
4. Inter-University Accelerator Center, Aruna Asaf Ali Marg, New Delhi 110067, India.
5. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
6. Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan
7. Institute for Molecular Science, Okazaki 4448585, Japan