1. Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
2. Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
3. Department of Mechanical, Aerospace and Biomedical Engineering, University of Tennessee Space Institute, Tullahoma, Tennessee 37388, United States
4. Department of Physics and Astronomy, Middle Tennessee State University, Murfreesboro, Tennessee 37132, United States
5. Laboratoire CRISMAT, ENSICAEN, CNRS UMR 6508, 14050 Caen, France
6. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, U.S. Department of Energy, Upton, New York 11973, United States
7. Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, United States