1. Department of Chemistry and Biochemistry, University of California, Santa Barbara, California, 93106-9510, United States
2. National Synchrotron Radiation Research Center, 101-Hsin Ann Road, 30077, Hsinchu, Taiwan, Republic of China
3. Institut für Physikalische Chemie, Universität Göttingen, Tammannstrasse 6, D-37077, Göttingen, Germany
4. Max-Planck-Institut für Biophysikalische Chemie, Karl Friedrich-Bonhoeffer-Institut, Am Fassberg 11, 37077, Göttingen, Germany