1. Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
2. Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States
3. Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
4. Smalley-Curl Institute, Rice University, 6100 Main Street, Houston, Texas 77005, United States