1. Environmental Sciences and Engineering Ph.D. Program, The University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States
2. Chemistry Department, The University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States
3. Advanced Light Source, Beamline 10.3.2, Lawrence Berkeley National Laboratories, Berkeley, California 94720, United States