Secondary ion emission from oxidized vanadium as a function of projectile energy in the range 10–90 MeV

Abstract

The intensity of secondary ion emission from oxidized V bombarded by 10–90 MeV 79Br projectiles has been measured. The intensity of V + ion emission was proportional to the nuclear stopping cross section for Br in V indicating that these ions were produced as a consequence of a collision cascade. However, I(O +) and I(F +) were approximately constant across the projectile energy range demonstrating that those ions were produced by a different mechanism. The variation of I(VO +) with projectile energy was intermediate between that of I(V +) and I(O +). Possible mechanisms for the production of the O + and F + secondary ions are discussed.