1. Department of Chemistry and Biochemistry, University of Mississippi, Oxford, Mississippi 38677, United States
2. Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, United States
3. CNR-ICCOM & IPCF, Consiglio Nazionale delle Ricerche, Pisa I-56124, Italy
4. School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
5. Dipartimento di Scienze Chimiche e Farmaceutiche, Università di Trieste, Trieste I-34127, Italy
6. Department of Applied Physics and Materials Science, Northern Arizona University, Flagstaff, Arizona 86011, United States
7. Department of Chemistry, Western Michigan University, Kalamazoo, Michigan 49008, United States