Dissociation of Kr+2, N2Ar+, (CO)+2, CH+5, and C2H+5 ions drifting in He

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Abstract
Rate coefficients for the dissociation of Kr+2, N2Ar+, (CO)+2, CH+5, and C2H+5 ions in collisions with He have been obtained in a drift tube experiment as dependent on the mean relative kinetic energy in the center‐of‐mass frame Ec in the range from 0.1 to 0.5 eV. The Arrhenius activation energies obtained for dissociation are 1.15, 0.91, 1.1–1.3, 1.1–1.4, and 1.3–1.7 eV for Kr+2, N2Ar+, (CO)+2, CH+5, and C2H+5 ions, respectively. For the thermal energy region, the rate coefficients for the same processes have been calculated from three‐body association rate coefficients reported in the literature, equilibrium constants, and known thermodynamic quantities. The values of the dissociation rate coefficients obtained cover a range of 15 to 50 orders of magnitude. The present data indicate that the internal temperature Ti of the drifting ions is in close equilibrium with Ec, i.e., Ec=3/2.kBTi.

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