1. Department of Physics, The City College of the City University of New York, New York, New York, 10031, Phillips Laboratory/GPID, 29 Randolph Rd., Hanscom AFB, Massachusetts 01731, Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York 10461, and CST-4, Mail Stop J586, Los Alamos National Laboratory, Los Alamos, New Mexico 87545