This opportunity consists of measuring, analyzing, and evaluating spacecraft materials properties that have a direct bearing on spacecraft charging (i.e., bulk and surface resistivities, dielectric constants, secondary electron emission, and photoemission). Measurements of materials properties and/or charging of materials under electron beam irradiation will be made using laboratory facilities at the Kirtland Air Force Base in Albuquerque, New Mexico. Special attention will be paid to changes of materials properties and spacecraft charging with temperature, contamination, radiation dose, and/or vacuum aging.