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Electron-impact excitation of diatomic hydride cations - I. HeH+, CH+, ArH+

Abstract : R-matrix calculations combined with the adiabatic nuclei approximation are used to compute electron-impact rotational excitation rates for three closed-shell diatomic cations, HeH+, CH+, ArH+. Comparisons with previous studies show that an improved treatment of threshold effects leads to significant changes in the low temperature rates; furthermore the new calculations suggest that excitation of CH+ is dominated by ΔJ = 1 transitions as is expected for cations with a large dipole moment. A model for ArH+ excitation in the Crab nebula is presented which gives results consistent with the observations for electron densities in the range 2-3 × 103 cm-3.
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James R. Hamilton, Alexandre Faure, Jonathan Tennyson. Electron-impact excitation of diatomic hydride cations - I. HeH+, CH+, ArH+. Monthly Notices of the Royal Astronomical Society, 2016, 455, pp.3281-3287. ⟨10.1093/mnras/stv2429⟩. ⟨insu-03691576⟩

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