1. Battelle Eastern Science and Technology Center, Aberdeen, Maryland 21001 (C.S.-C.Y.); Department of Physics, Hampton University, Hampton, Virginia 23668 (E.B., U.H.); Brimrose Corporation of America, Baltimore, Maryland 21152 (S.B.T.); and Edgewood Chemical Biological Center, Aberdeen Proving Ground, Maryland 21010-5424 (A.C.S., A.P.S.)