Rotational transitions induced by collisions of HD${}^{+}$ ions with low energy electrons

Abstract

A series of Multichannel Quantum Defect Theory-based computations have been performed, in order to produce the cross sections of rotational transitions (excitations $N_i^{+}-2\to$ $N_i^{+}$, de-excitations $N_i^{+}$ $\to$ $N_i^{+}-2$, with $N_i^{+}=2$ to $10$) and of their competitive process, the dissociative recombination, induced by collisions of HD${}^{+}$ ions with electrons in the energy range $10^{-5}$ to 0.3 eV. Maxwell anisotropic rate coefficients, obtained from these cross sections in the conditions of the Heidelberg Test Storage Ring (TSR) experiments ($k_B{T}_t=2.8$ meV and $k_B{T}_l=45$ $\mu$eV), have been reported for those processes in the same electronic energy range. Maxwell isotropic rate coefficients have been as well presented for electronic temperatures up to a few hundreds of Kelvins. Very good overall agreement is found between our results for rotational transitions and the former theoretical computations as well as with experiment. Furthermore, owing to the full rotational computations performed, the accuracy of the resulting dissociative recombination cross sections is considerably improved.

arXiv comment9 pages, 8 figures, 1 table. arXiv admin note: text overlap with arXiv:1107.5267

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• The chemistry of vibrationally excited H2 in the interstellar medium
• Vibrational level population of H${}_2$ and H${}_2^{+}$ in the early Universe
• Near threshold rotational excitation of molecular ions by electron-impact
• First Measurements of the Electron Density Enhancements Expected in C-shocks
• Calculation of rate constants for vibrational and rotational excitation of the H3+ ion by electron impact
• Assignment of resonances in dissociative recombination of HD+ ions: high-resolution measurements compared with accurate computations

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• Reactive collisions between electrons and BeT${}^{+}$: Complete set of thermal rate coefficients up to 5000 K
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• Competing Ionization and Dissociation in the H${}_2$ Gerade System
• Dissociative recombination of N${}_2$H${}^{+}$: A revisited study