1. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan, ROC, Department of Chemistry, National Taiwan University, Taipei, Taiwan, ROC, Center for Condensed Matter Sciences, National Taiwan University, Taipei, Taiwan, ROC, Institute of Physics, Vilnius, Lithuania, Institute of Botany, Academia Sinica, Taipei, Taiwan, ROC, and State Key Laboratory for Ultrafast Laser Spectroscopy, Zhongshan University, Quangzhou, PRC