1. Department
of Physics, Washington University, One Brookings Drive, St. Louis, Missouri 63130, United States
2. Now
at Department of Chemistry, Georgetown University, 37th and O Streets NW, Washington, DC, 20057, United States
3. RCB Hydrides, LLC, 117 Miami
Avenue, Franklin, Ohio 45005, United States
4. Department
of Metallurgical Engineering, University of Utah, 135 South 1460
East, Room 412, Salt Lake City, Utah 84112-0114, United States
5. Center
for Nanoscience and Department of Physics and Astronomy, University of Missouri-St. Louis, One University Boulevard, St. Louis, Missouri 63121, United States