Collision-Induced Dissociation on HD+ by Rare Gases

Abstract

Absolute cross sections and kinetic isotope ratios for the dissociation of MD+ into protons and deuterons when striking helium, neon, argon, krypton, and xenon are reported up to 50-eV incident kinetic energy. The calibration of the tandem mass spectrometer is described in detail. The spectator mechanism for ion–molecule reactions has been elaborated to account for the periodic maxima observed in the cross sections of these collision-induced reactions.