1. Department of Physics, CUNY-City College of New York, New York, NY 10031, USA
2. Department of Physics, CUNY-Graduate Center, New York, NY 10016, USA
3. Department of Chemistry, CUNY-City College of New York, New York, NY 10031, USA
4. Ph. D. Program in Chemistry, The Graduate Center of the City University of New York, New York, NY, 10016, USA.