1. Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, Department of Chemistry, Lomonosov Moscow State University, 119899 Moscow, Leninskie Gory, Russia, Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, Electron Microbeam Analysis Laboratory, University of Michigan, Ann Arbor, Michigan 48109, and Nomadics Inc., 1024 Innovation Parkway, Stillwater, Oklahoma 74074