1. Department of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405, United States
2. Department Physics and Astronomy, University of Nebraska, 855 N 16th Street, Lincoln, Nebraska 68588-0299, United States
3. IU Bloomington Electron Microscopy Center, Bloomington, Indiana 47405, United States
4. Department of Chemistry, NMR-3, Dalhousie University, Halifax, Nova Scotia B3H 4J3, Canada