1. Graduate School of Science and Technology, Niigata University, Ikarashi, Niigata-shi, Niigata-ken 950-21
2. Department of Physics, Faculty of Science, Niigata University, Ikarashi, Niigata-shi, Niigata-ken 950-21
3. Department of Chemistry, Faculty of Science, Yamagata University, Koshirakawa-cho, Yamagata-shi, Yamagata-ken 990
4. Institute for Advanced Materials Processing, Tohoku University, Katahira, Aoba-ku, Sendai-shi, Miyagi-ken 980