1. National Institute for Materials Science, Tsukuba, Ibaraki 305-0003
2. National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568
3. Research Centre for Spectrochemistry, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033
4. Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581
5. Institute for Molecular Science, Okazaki, Aichi 444-8585
6. National High Magnetic Field Laboratory, Florida State University, Tallahassee FL 32306, U.S.A.