%0 Journal Article %T Electron-impact excitation of diatomic hydride cations II: OH+ and SH+ %+ Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) %A Hamilton, James R. %A Faure, Alexandre %A Tennyson, Jonathan %< avec comité de lecture %@ 0035-8711 %J Monthly Notices of the Royal Astronomical Society %I Oxford University Press (OUP): Policy P - Oxford Open Option A %V 476 %P 2931-2937 %8 2018 %D 2018 %Z 1802.07566 %Z 2018MNRAS.476.2931H %R 10.1093/mnras/sty437 %K line: formation %K molecular data %K molecular processes %K ISM: molecules %K Astrophysics - Solar and Stellar Astrophysics %K Astrophysics - Astrophysics of Galaxies %Z Sciences of the Universe [physics] %Z Sciences of the Universe [physics]/Astrophysics [astro-ph]Journal articles %X 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. %G English %2 https://insu.hal.science/insu-03693559/document %2 https://insu.hal.science/insu-03693559/file/sty437.pdf %L insu-03693559 %U https://insu.hal.science/insu-03693559 %~ INSU %~ UNIV-SAVOIE %~ UGA %~ CNRS %~ INPG %~ IRSTEA %~ CNES %~ OSUG %~ IPAG %~ AGREENIUM %~ INRAE %~ UGA-COMUE %~ USMB-COMUE