Dissociative recombination of CH${}^{+}$ molecular ion induced by very low energy electrons

Abstract

We used the multichannel quantum defect theory to compute cross sections and rate coefficients for the dissociative recombination of CH${}^{+}$ initially in its lowest vibrational level $v_i^{+}=0$ with electrons of incident energy bellow $0.2$ eV. We have focused on the contribution of the $2$ ${}^2\Pi$ state which is the main dissociative recombination route at low collision energies. The final cross section is obtained by averaging the relevant initial rotational states $(N_i^{+}=0,\dots ,10)$ with a $300$ K Boltzmann distribution.The Maxwell isotropic rate coefficients for dissociative recombination are also calculated for different initial rotational states and for electronic temperatures up to a few hundred Kelvins. Our results are compared to storage-ring measurements.

5 pages, 5 figures

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