1. Photoreaction Control Research Center, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
2. Sumitomo Osaka Cement Company, Ltd., 585 Toyotomi, Hunabashi, Chiba 274-8601, Japan