1. Institute for Surface and Interface Science, University of California Irvine, Irvine, CA 92697–2375, USA.
2. Department of Physics and Astronomy, University of California Irvine, Irvine, CA 92697–4576, USA.
3. Department of Molecular Biology and Biochemistry, University of California Irvine, Irvine, CA 92697–4292, USA.
4. Department of Chemistry, University of California Irvine, Irvine, CA 92697–2025, USA.