1. National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Ibaraki, Japan
2. Tosoh Corporation, Advanced Materials Research Laboratory, 2743-1 Hayakawa, Ayase, Kanagawa 252-1123, Japan
3. Tosoh Corporation, 3-8-2 Shiba, Minato-Ku, Tokyo 105-8623, Japan
4. Tosoh Corporation, Technology Center, 4560 Kaiseicho, Shunan, Yamaguchi 746-8501, Japan