1. Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
2. Department of Chemistry, University of California at Davis, Davis, California 95616, United States
3. Department of Chemistry, University of Houston, Houston, Texas 77204, United States
4. Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, United States
5. U.S. Department of Energy, Ames Laboratory, Ames, Iowa 50011, United States