1. Department of Chemical
and Petroleum Engineering and Department of Chemistry, University of Kansas, Lawrence, Kansas 66047, United States
2. Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, People’s Republic of China
3. Center for Nanophase Materials Sciences and Chemical
Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
4. Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
5. Department
of Physics, Arizona State University, Tempe, Arizona 85287, United States
6. Department
of Physics, Yeshiva University, New York, New York 10016, United States