Rotational relaxation of HCO+ and DCO+ by collision with H2
| dc.contributor.author | DENIS-ALPIZAR, Otoniel | |
| hal.structure.identifier | Institut des Sciences Moléculaires [ISM] | |
| dc.contributor.author | STOECKLIN, Thierry | |
| hal.structure.identifier | AMOR 2020 | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| dc.contributor.author | DUTREY, Anne | |
| hal.structure.identifier | AMOR 2020 | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| dc.contributor.author | GUILLOTEAU, Stéphane | |
| dc.date.issued | 2020 | |
| dc.identifier.issn | 0035-8711 | |
| 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 H 2 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-H 2 , 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 +-H 2 system, and adapted to the DCO +-H 2 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-H 2 were compared with the available data, and a set of rate coefficients for HCO + + ortho-H 2 is also reported. The difference between the collision rates with ortho-and para-H 2 is found to be small. These calculations confirm that the use of the rate coefficients for HCO + + para-H 2 for estimating those for HCO + + ortho-H 2 as well as for DCO + + para-H 2 is a good approximation. | |
| dc.language.iso | en | |
| dc.publisher | Oxford University Press (OUP): Policy P - Oxford Open Option A | |
| dc.rights.uri | http://creativecommons.org/licenses/by/ | |
| 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]/Astrophysique [astro-ph] | |
| dc.subject.hal | Chimie/Autre | |
| bordeaux.journal | Monthly Notices of the Royal Astronomical Society | |
| bordeaux.page | 4276 - 4281 | |
| bordeaux.volume | 497 | |
| bordeaux.issue | 4 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-03044185 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-03044185v1 | |
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