Electron-impact dissociation of CD 3+ and CH 3+ ions producing CD 2+, CH+, and C+ fragment ions

Using a crossed electron-ion beams method, we measured absolute cross sections for electron-impact dissociation of the CD 3+ molecular ions producing CD 2+ fragment ions and CH 3+ 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 predissociation 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 CD 2+ and C+ fragments.