1. Department of Electrical and Computer Engineering, Michigan State University, 2120 Engineering Building, East Lansing, Michigan 48824, Jet Propulsion Laboratory, Pasadena, California 91109, Department of Chemistry, Howard University, Washington, D.C. 20059, Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, and NASA Goddard Space Flight Center, Greenbelt, Maryland 20771