1. Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
2. SOKENDAI (The Graduate University for Advanced Studies), Myodaiji, Okazaki 444-8585, Japan
3. Institute for Fiber Engineering, Shinshu University, Ueda, Nagano 386-8567, Japan
4. Physikalische Chemie, Freie Universität Berlin, Takustr. 3, D-14195 Berlin, Germany