1. Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400
2. Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794-2100
3. Nano-Material Research Center, Korea Institute of Science and Technology, P.O. Box. 131, Cheongryang, Seoul-130-650, Korea
4. Department of Geosciences, Stony Brook University, Stony Brook, New York 11794-2100