1. Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA
2. Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
3. Dept. Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108, USA
4. Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
5. Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089, USA
6. Department of Chemistry, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi-110016, India
7. Department of Materials Science and Engineering (DMSE), Indian Institute of Technology, Delhi, Hauz Khas, New Delhi-110016, India