Single-Electron Detachment for Transition Elements Cr−and Fe− in Collision with He

Single-electron detachment (SED) cross-sections for Cr− and Fe− in collisions with He have been obtained in the energy region of 10–30 keV for the first time. In the present energy range the magnitude of the Cr−+ He SED cross-sections is close to that of Fe−+ He, although the electron affinity of Fe− (0.16 eV) and Cr− (0.668 eV) are different. It is found that the cross-sections for Cr− and Fe− in collisions with He exhibit nearly the same dependence on anions impact velocity.