Z1oscillations in yields of multicharged ions emitted from a germanium surface when bombarded by light ions

Abstract

The interaction radii at which holes are created in the L shell of light projectiles and in the M shell of germanium during ionsurface-atom collisions have been determined from the thresholds for doubly charged ion production. In contrast to the data with a silicon target, the interaction radius at which electron promotion occurs does not decrease with projectile atomic number Zq, as it should if promotion occurs at a definite level crossing. In addition, the yields of doubly charged ions do not follow the Zi dependence predicted by the Fano-Lichten electron-promotion model [Phys. Rev.