1. The Graduate Center; City University of New York (CUNY); 365 5th Ave. New York NY 10016 USA
2. Department of Physics; The City College of New York; 160 Convent Ave. New York NY 10031 USA
3. Department of Chemistry; The City College of New York; 160 Convent Ave. New York NY 10031 USA
4. Institute of Photonics; University of Strathclyde; 106 Rottenrow G4 0NW Glasgow UK