1. The Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
2. The Department of Chemistry, The University of Missouri, Columbia, Missouri 65211, United States
3. Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973-5000, United States
4. Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States