1. Department of Chemistry, Georgetown University, 37th and O Streets NW, Washington, D.C. 20057, United States
2. Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
3. National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
4. Department of Physics, Florida State University, Tallahassee, Florida 32310, United States