1. State Key Laboratory of Quantum Optics and Quantum Optics Devices
2. Institute of Laser Spectroscopy
3. Shanxi University
4. Taiyuan 030006
5. China
6. Freie Universität Berlin
7. Institut für Chemie und Biochemie
8. 14195 Berlin
9. Germany
10. University of Nebraska-Lincoln
11. Nanocluster Laboratory
12. Institute of Molecular Science