1. Contribution from the Department of Chemistry, Washington University, St. Louis, Missouri 63130, Hunter College and The Rockefeller University, New York, New York 10021, Department of Chemistry, University of California, Davis, California 95616, Biomolecular Materials and Interfaces Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, Institute of Molecular and Atomic Physics, National Academy of...