1. Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
2. Research Institute for Engineering, Kanagawa University, Yokohama 2210802, Japan
3. Advanced Ultrafast Laser Research Center, The University of Electro-Communications, Chofu 1828585, Japan
4. Department of Chemistry, Faculty of Engineering, Kanagawa University, Yokohama 2218686, Japan
5. JILA, National Institute of Standards and Technology and University of Colorado Boulder, Boulder, Colorado 80309, United States
6. Department of Chemistry, University of Colorado Boulder, Boulder, Colorado 80309, United States