1. Department of Chemistry and Biochemistry, Florida State University, 95 Chieftain Way, Tallahassee, Florida 32310, United States, Ion Cyclotron Resonance Program, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States, and S. C. Beu Consulting, 12449 Los Indios Trail, Austin, Texas 78729, United States