Institution: | 1. Graduate School of Science and Technology, Kobe University, Nada, Kobe, Hyogo 657‐8501, Japan;2. Molecular Photoscience Research Center, Kobe University, Nada, Kobe, Hyogo 657‐8501, Japan;3. Research Center for Development of Far‐Infrared Region, University of Fukui, 3‐9‐1 Bunkyo, Fukui, Fukui 910‐8507, Japan |