1. Department of Chemistry, State University of New York, Stony Brook, New York 1179-3400, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Building 480, Upton, New York 11973, Graduate Program in Biophysics, State University of New York, Stony Brook, New York 11794, and Graduate Program in Biochemistry and Structural Biology, State University of New York, Stony Brook, New York 11794