1. Group C-ADI, MS J565, Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (K.Y.Y., L.E.F., M.P.D.); Applied Research Associates, Inc., 4300 San Mateo Blvd. NE, Albuquerque, New Mexico 87110 (D.A.C.); and Group EES-2, MS J495, Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (R.D.H.)