1. Departments of Chemistry, Physics, Chemical Engineering, and Geosciences, Virginia Tech, Blacksburg, Virginia 24061, United States
2. Département de Physique, Université de Montréal, Complexe des Sciences, 1375 Avenue Thérèse-Lavoie-Roux, Montréal, QC H2 V 0B3, Canada
3. Department of Chemistry and Biochemistry, Purdue University Fort Wayne, Fort Wayne, Indiana 46805, United States