1. Nuclear Materials and Technology Division, NMT-1, Los Alamos National Laboratory, MS G740, Los Alamos, New Mexico 87545, Life Sciences Division, LS-5, Los Alamos National Laboratory, MS M888, Los Alamos, New Mexico 87545, Chemical Science and Technology Division, CST-9, Los Alamos National Laboratory, MS K484, Los Alamos, New Mexico 87545, and Department of Chemistry, University of Florida, Gainesville, Florida 32611