1. Contribution from the Dept. of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of NebraskaLincoln, Lincoln, Nebraska 68588-0111, Center for Nanoscale Science and Engineering, North Dakota State University, 1805 NDSU Research Park Drive, Fargo, North Dakota 58102, Dept. of Chemistry and the Center for Materials Research and Analysis, University of NebraskaLincoln, Lincoln, Nebraska 68588-0111, Brookhaven National Laboratory, National Synchrotron Light Source, Upton,...