Hamilton, JR;
Faure, A;
Tennyson, J;
(2018)
Electron-impact excitation of diatomic hydride cations II: OH+ and SH+.
Monthly Notices of the Royal Astronomical Society
, 476
(3)
pp. 2931-2937.
10.1093/mnras/sty437.
Preview |
Text
sty437.pdf - Published Version Download (761kB) | Preview |
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 x e = 10 -4 and an OH + column density of 3×10 13 cm -2 . Electron-impact electronic excitation cross-sections and rate coefficients for the ions are also presented.
| Type: | Article |
|---|---|
| Title: | Electron-impact excitation of diatomic hydride cations II: OH+ and SH+ |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/sty437 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/sty437 |
| Language: | English |
| Additional information: | © The Author 2018. Published by Oxford University Press on behalf of The Royal Astronomical Society.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10046282 |
Archive Staff Only
 |
View Item |
