1. Yale Chemistry Department, 225 Prospect
Street, New Haven, Connecticut 06520-8107
2. Department of Physics, University of Stockholm,
Box 6730, S-113 85 Stockholm, Sweden
3. Laboratoire de Structure et Dynamique des
Systèmes Moléculaires et Solides (UMR 5636), Bât. 15,Université
de Montpellier, 34095 Montpellier Cedex 05, France
4. Department of Chemistry, University of
Delaware, Newark, Delaware 19716
5. Department of Chemistry, Brookhaven National
Laboratory, P.O. Box 5000, Upton, New York 11973