MONTE-CARLO EVALUATION OF THE INFLUENCE OF THE INTERACTION CROSS-SECTIONS ON THE SECONDARY-ELECTRON-EMISSION YIELDS FROM POLYCRYSTALLINE ALUMINUM TARGETS

The aim of this paper is to show that different assumptions for the in teraction cross sections of low-energy electrons in polycrystalline al uminum targets lead to very different calculated values of secondary-e lectron yields, either in backscattering or in transmission. We emphas ize the importance of the description of elastic collisions, of the ch oice of the dielectric function, and the role of ionizing collisions. We indicate that the comparisons between the published theoretical res ults are somewhat intricate due to the differences in the transport de scription and in the choice of cross sections,