Electron-Impact Dissociation of CD₃⁺ and CH₃⁺ Ions Producing CD₂^+...

Using a crossed electron-ion beams method, we measured absolute cross sections for electron-impact dissociation of the CD₃⁺ molecular ions producing CD₂⁺ fragment ions and CH₃⁺ ions yielding CH⁺ and C⁺ fragment ions over a collision energy range from a few eV up to 100 eV. The total experimental uncertainties are about 12% at the maximum of the curves of cross sections (peak of the cross section, for the CH⁺ channel). The obtained results suggest important roles played by pre-dissociation of bound states in the production of both the CH⁺ and C⁺ fragment ions. Good agreement is found with other results reported for the CH⁺ fragment, but some differences are found for the CD₂⁺ and C⁺.