1. Department of Chemistry, University of Michigan, 930 N. University, Ann Arbor, Michigan 48109-1055, United States
2. Department of Chemistry, Colorado College, 14 East Cache la Poudre St., Colorado Springs, Colorado 80903, United States
3. Hummingbird Scientific, 2610 Willamette Drive NE, Suite A, Lacey, Washington 98516, United States
4. Program in Applied Physics, University of Michigan, 930 N. University, Ann Arbor, Michigan 48109-1055, United States