ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.467496
