1. Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0339
2. Department of Chemistry, Hong Kong University of Science and Technology, Kowloon, Hong Kong
3. Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
4. University of Florida, Quantum Theory Project, P.O. Box 118435, Gainesville, Florida 32611-8435
5. Department of Chemistry, University of North CarolinaWilmington, Wilmington, North Carolina 28403-3297