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Electron-impact excitation of diatomic hydride cations II: OH+ and SH+

Abstract : R-matrix calculations combined with the adiabatic-nuclei-rotation and Coulomb-Born approximations are used to compute electron-impact rotational rate coefficients for two open-shell diatomic cations of astrophysical interest: the hydoxyl and sulphanyl ions, OH+ and SH+. Hyperfine resolved rate coefficients are deduced using the infinite-order-sudden approximation. The propensity rule ΔF = Δj = ΔN = ±1 is observed, as is expected for cations with a large dipole moment. A model for OH+ excitation in the Orion Bar photon-dominated region is presented which nicely reproduces Herschel observations for an electron fraction xe = 10-4 and an OH+ column density of 3 × 1013 cm-2. Electron-impact electronic excitation cross-sections and rate coefficients for the ions are also presented.
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James R. Hamilton, Alexandre Faure, Jonathan Tennyson. Electron-impact excitation of diatomic hydride cations II: OH+ and SH+. Monthly Notices of the Royal Astronomical Society, 2018, 476, pp.2931-2937. ⟨10.1093/mnras/sty437⟩. ⟨insu-03693559⟩

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