Abstract
Anodically oxidized Ta2O5 surfaces were sputtered with 300–1800‐eV He+ and Ar+ ions. The surface composition was measured with AES and ISS. The results clearly show that the equilibrium surface composition depends on mass and energy of the primary ions. This composition is reversible for different masses or energies. A short discussion of these effects is given, including the characteristic fluence for obtaining equilibrium.