Rotational relaxation of HCO+ and DCO+ by collision with H2
dc.contributor.author | DENIS-ALPIZAR, Otoniel | |
dc.contributor.author | STOECKLIN, Thierry | |
hal.structure.identifier | AMOR 2020 | |
dc.contributor.author | DUTREY, Anne | |
hal.structure.identifier | AMOR 2020 | |
dc.contributor.author | GUILLOTEAU, S. | |
dc.date.accessioned | 2021-07-07T15:38:27Z | |
dc.date.available | 2021-07-07T15:38:27Z | |
dc.date.created | 2020-08 | |
dc.date.issued | 2020-08-05 | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/95105 | |
dc.description.abstractEn | The HCO+ and DCO+ molecules are commonly used as tracers in the interstellar medium. Therefore, accurate rotational rate coefficients of these systems with He and H2 are crucial in non-local thermal equilibrium models. We determine in this work the rotational de-excitation rate coefficients of HCO+ in collision with both para- and ortho-H2, and also analyse the isotopic effects by studying the case of DCO+. A new four-dimensional potential energy surface from ab initio calculations was developed for the HCO+-H2 system, and adapted to the DCO+-H2 case. These surfaces are then employed in close-coupling calculations to determine the rotational de-excitation cross-sections and rate coefficients for the lower rotational states of HCO+ and DCO+. The new rate coefficients for HCO+ + para-H2 were compared with the available data, and a set of rate coefficients for HCO+ + ortho-H2 is also reported. The difference between the collision rates with ortho- and para-H2 is found to be small. These calculations confirm that the use of the rate coefficients for HCO+ + para-H2 for estimating those for HCO+ + ortho-H2 as well as for DCO+ + para-H2 is a good approximation. astrochemistry; molecular data; molecular processes; scattering; ISM: molecules | |
dc.language.iso | en | |
dc.publisher | Oxford University Press (OUP): Policy P - Oxford Open Option A | |
dc.subject.en | astrochemistry | |
dc.subject.en | molecular data | |
dc.subject.en | molecular processes | |
dc.subject.en | scattering | |
dc.subject.en | ISM: molecules | |
dc.title.en | Rotational relaxation of HCO+ and DCO+ by collision with H2 | |
dc.type | Article de revue | |
dc.identifier.doi | 10.1093/mnras/staa2308 | |
dc.subject.hal | Planète et Univers [physics] | |
bordeaux.journal | Monthly Notices of the Royal Astronomical Society | |
bordeaux.page | 4276-4281 | |
bordeaux.volume | 497 | |
bordeaux.hal.laboratories | Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804 | * |
bordeaux.issue | 4 | |
bordeaux.institution | CNRS | |
bordeaux.institution | Université de Bordeaux | |
bordeaux.peerReviewed | oui | |
hal.identifier | hal-03065125 | |
hal.version | 1 | |
hal.origin.link | https://hal.archives-ouvertes.fr//hal-03065125v1 | |
bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Monthly%20Notices%20of%20the%20Royal%20Astronomical%20Society&rft.date=2020-08-05&rft.volume=497&rft.issue=4&rft.spage=4276-4281&rft.epage=4276-4281&rft.eissn=0035-8711&rft.issn=0035-8711&rft.au=DENIS-ALPIZAR,%20Otoniel&STOECKLIN,%20Thierry&DUTREY,%20Anne&GUILLOTEAU,%20S.&rft.genre=article |
Files in this item
Files | Size | Format | View |
---|---|---|---|
There are no files associated with this item. |