SECONDARY-ELECTRON YIELDS FROM THE BOMBARDMENT OF AL2O3 BY PROTONS, DEUTERONS, ALPHA-PARTICLES AND POSITIVELY CHARGED HYDROGEN MOLECULES ATENERGIES IN THE RANGE OF 10 TO 80 MEV

Measurements of the electron coefficients of Al2O3 surfaces bombarded by protons, deuterons, alphas and single ionized hydrogen molecules ar e presented. The 76 ''-cyclotron of the Crocker Nuclear Laboratory of the University of California was used to accelerate those ions in the range of 10 to 80 MeV. The data has been compared to theoretical predi ctions and to previous experimental work. For Z=1 the yields are consi stent with the scaling of the stopping power with the ion mass. For Z= 2 the results agree well for energies above 40 MeV. At lower energies the yields are lower than predicted.