1. Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064, United States
2. Department of Physics, Mother Teresa Women’s University, Kodaikanal 624 101, Tamil Nadu, India
3. National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. NASA Ames Research Center, Moffett Field, California 94035, United States