Abstract

The absolute single electron detachment (SED) cross sections of carbon group elements C −, Si −, Ge − in the energy range of 0.05–0.29 a.u. (5 keV–30 keV) and oxygen group elements O − and S − 0.08–0.27 a.u. (5 keV–30 keV), incident on helium are measured with growth rate method. In our energy region, the SED cross sections of C −, Si −, S − and Ge − increase with the projectiles velocity, at the same time, O − cross sections reach a conspicuous maximum at 0.18 a.u. Some abnormal behavior occurs in measurement of SED cross sections for the oxygen group collision with helium. Our results have been compared with a previous work.

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