1. Department of Chemistry, University of California Davis, Davis, California 95616-5270, United States
2. Université de Lorraine, CNRS, LPTC, F-54000 Nancy, France
3. Department of Physics, University of North Texas Denton, Texas 76203, United States
4. Department of Land, Air and Water Resources, University of California Davis Davis, California 95616-8627, United States