1. Department of Physics, Brooklyn College of the City University of New York, Brooklyn, New York 11210, USA
2. Ph.D. Program in Physics, The Graduate Center of the City University of New York, New York, NY 10016, USA
3. Department of Chemistry, Lehman College of the City University of New York, Bronx, New York 10468, USA
4. Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, NY 10016, USA