1. Department of Chemistry, School of Science, The University
of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Institut
Parisien de Chimie Moléculaire, UMR CNRS 7201, UPMC Univ Paris
06, case 42, 4 place Jussieu, F-75252 Paris Cedex 05, France, and
Laboratoire National des Champs Magnétiques Intenses, UPR CNRS
3228, 25 rue des Martyrs, B.P. 166, 38042 Grenoble Cedex 9, France