1. For example, Dynamic Spin Chemistry (S. Nagakura, H. Hayashi, T. Azumi, eds.), Kodansha/Wiley, Tokyo (1998) and references therein.
2. H. Hayashi, Y. Sakaguchi, M. Wakasa, Bull. Chem. Soc. Jpn., 74, 773 (2001) and references therein.
3. Y. Tanimoto, Y. Fujiwara, Handbook of Photochemistry and Photobiology, Volume 1, Inorganic Photochemistry (H. S. Nalwa, ed.). American Scientific Publishers, USA (2003) Chapt. 10 and references therein.
4. H. Hayashi, S. Nagakura, Bull. Chem. Soc. Jpn., 57, 322 (1984).
5. R. Nakagaki, M. Hiramatsu, K. Mutai, Y. Tanimoto, S. Nagakura, Chem. Phys. Lett., 134, 171 (1987).