Electron-impact dissociation of D¹³CO⁺ molecular ions to ¹³CO⁺ ions

Absolute cross sections for electron-impact dissociation of D ¹³CO⁺ ions have been measured over a collision energy range from 4 to 100 eV with a crossed electron-ion beams method. Total experimental uncertainties are about 16% near the cross section peak. The role of resonant and direct dissociative excitation for energies below 21 eV is discussed in light of the energy levels and photo-dissociation cross sections of the HCO⁺ formyl cation predicted by ab initio multi-reference configuration interaction calculations.