Single and double electron detachment absolute cross sections of H⁻ and D⁻ in collisions with diatomic and triatomic gases

Collisional single electron detachment (SED) and double electron detachment (DED) absolute cross sections of H − and D − with N 2 , O 2 , NO, N 2 O, and CO 2 are measured by using the growth-rate method. The impact energy ranges from 10 to 30 keV. Except N 2 , the SED cross sections colliding with gases do not vary much with the incident velocity of H − or D − . While the DED cross sections show a slowly increasing tendency. In previous work, the SED absolute cross sections of H − or D − colliding with SF 6 and CF 4 are proportional to the bond length in target molecule and the radius of the incident anionic projectile. However, such dependency is not observed for the SED cross sections of diatomic and triatomic linear molecules. An analysis based on inelastic collision is used to understand the trends of SED and DED cross sections.