1. Contribution from the Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Department of Chemistry, University of California, Berkeley, California 94720-5230, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100, Denmark, Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, Department of Chemistry, Stanford...