1. Department of Chemistry and Department of Physics, University of Houston, Houston, Texas 77204, USA and Department of Physics, Durham University, Durham, United Kingdom
2. Department of Chemistry, University of Houston, Houston, Texas 77204, USA
3. Theoretical Division, Los Alamos National Lab, Los Alamos, New Mexico 87545, USA
4. School of Chemistry & Biochemistry and School of Physics, Georgia Institute of Technology, 901 Atlantic Drive, Atlanta, Georgia 30332, USA
5. Center for Nano Science and Technology @Polimi, Istituto Italiano di Tecnologia, via Giovanni Pascoli 70/3, 20133 Milano, Italy