Auger Electron Ejection from Tungsten Surfaces by Low-Energy Ions

Work on the study of the ejection of electrons from the surface of polycrystalline tungsten by ${\mathrm{He}}^{+}$, ${\mathrm{H}}_2^{+}$, ${\mathrm{N}}_2^{+}$, and ${\mathrm{O}}_2^{+}$ is reported. The total yields and energy distributions of the Auger electrons ejected by ions of 50-, 100-, and 200-eV kinetic energy are measured. The influence of adsorbed gases at the tungsten surface on the yields and energy distributions is also studied.