Electron detachment in H- (D-) collisions with rare-gas atoms: energy spectra of the detached electrons

The energy spectra of detached electrons resulting from detachment collisions of H-(D-) ions with rare-gas atoms (He, Ne, Ar, Kr and Xe) have been measured for collision energies between 2 and 250 eV. In this collision energy range, most of the detached electrons are distributed below 1 eV, with a very narrow distribution at low collision energies and a wider distribution as the collision energy increases. Particular attention has been paid to the problem of detector transmission at these low electron energies. The results for H-He and H-Ar show systematic deviations from earlier measurements. The angular dependence of the electron energy spectra is weak in the collision energy range studied. Only for H-Xe at 50 eV are the spectra found to exhibit a systematic variation with the observation angle. The comparison between the H and D results indicates that the collision velocity plays a decisive role for the energy distribution of the detached electrons.

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