1. Department of Chemistry, Smalley Institute for Nanoscale Science and Technology, Rice University, MS-222, 6100 Main Street, Houston, Texas 77005
2. ICYS-MANA, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
3. Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627
4. Department of Chemistry, Mokwon University, Daejon, 302-729, Republic of Korea