1. Department of Chemistry and Biochemistry and Center for Actinide Science, Auburn University, Auburn, Alabama 36849, Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, Department of Physics and Astronomy, Tufts University, Medford, Massachusetts 02155, and Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720