1. Diffraction Group BP 156, Institut Laue-Langevin, 6 rue Jules Horowitz, F-38042
Grenoble Cedex 9, France
2. Department of Chemistry and Research Institute of Basic Science, Kyung Hee University, Seoul 130-701, Republic of Korea
3. Institut Néel, CNRS et Université Joseph Fourier, BP 166, 38042
Grenoble, France
4. Istituto di Struttura della Materia-C.N.R. Sez. Montelibretti,
via Salaria km 29.300, P.O. Box 10, 00015 Monterotondo (RM), Italy.
5. Department of Chemistry, North Carolina State University, Raleigh, North Carolina
27695-8204, United States