1. The Department of Chemistry, Yale University, P. O. Box 208107, New Haven, Connecticut 06520, United States
2. Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
3. Chemistry Division, Energy & Photon Sciences Directorate, Brookhaven National Laboratory, Upton, New York 11973, United States
4. Energy Sciences Institute, Yale University, West Haven, Connecticut 06516, United States