Total electron detachment cross sections for collisions of H^-and He and F^-with atomic and molecular targets

Abstract

Absolute total electron detachment cross sections for collisions of H- and D- with He, and F- with He, Ne, Ar, CO, N2 O2 and CO2 have been measured in the energy range from about 1 up to 300 eV. The results for H-(D-)+He are found to be in very good agreement with the recent theoretical calculations of Gauyacq (1980) and Taylor and Delos (1982). The thresholds for electron detachment in F- collisions are found to be approximately 7 eV for all targets except O2, which has a threshold of about 4 eV. For this latter case, evidence of some charge transfer producing O2- (or O-+O) is also observed.