J/A+A/680/A113ivo://CDS.VizieR/J/A+A/680/A113CDSDenis-Apizar O.Guerra C.Zarate X.2026-07-09T18:27:55Z2026-07-09T19:27:34ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fratomic-physicsIn typical molecular clouds, analyzing the physic-chemical conditions with non-LTE models requires the knowledge of the collisional rate coefficients of the detected molecule with the most common colliders in the interstellar medium (ISM), e.g., H_2_, He, and H. The OCS molecule has been widely observed in the ISM. However, the collision data available for this species were calculated using a potential energy surface (PES) that shows differences with more recent surfaces. The main goal of this work is to report a new set of rate coefficients for the collisional of OCS with He based on a new PES computed at a high level of theory. A large set of ab initio energies calculated using the coupled cluster with single, double, and perturbative triple excitations (CCSD(T)) method at the completed basis set limit for the OCS+He complex is employed to develop an analytical PES. This surface is used in close-coupling calculations, and a new set of collisional rate coefficients for OCS by He is computed. The de-excitation rate coefficients are compared with previously available data. Furthermore, a |{DELTA}j|=1 propensity rule was observed. Finally, a set of rate coefficients for the lower thirty-nine rotational states of OCS are reported, which is the largest set determined up to date for this collision.2023A&A...680A.113Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/680/A113CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/680/A113https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/680/A113http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/680/A113https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/680/A113https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/680/A113http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/680/A113GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/680/A113/table2Rotational rate coefficients of OCS by collision with He at several temperaturesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintjiInitial rotational state of OCSphys.atmol.initialintjfFinal rotational state of OCSphys.atmol.finalintCR5KCollision rates for T=5K, in cm^3^/molecule/scm**3.mol**-1.s**-1arith.rate;phys.atmol.collisionaldoubleCR10KCollision rates for T=10K, in cm^3^/molecule/scm**3.mol**-1.s**-1arith.rate;phys.atmol.collisionaldoubleCR15KCollision rates for T=15K, in cm^3^/molecule/scm**3.mol**-1.s**-1arith.rate;phys.atmol.collisionaldoubleCR20KCollision rates for T=20K, in cm^3^/molecule/scm**3.mol**-1.s**-1arith.rate;phys.atmol.collisionaldoubleCR30KCollision rates for T=30K, in cm^3^/molecule/scm**3.mol**-1.s**-1arith.rate;phys.atmol.collisionaldoubleCR40KCollision rates for T=40K, in cm^3^/molecule/scm**3.mol**-1.s**-1arith.rate;phys.atmol.collisionaldoubleCR60KCollision rates for T=60K, in cm^3^/molecule/scm**3.mol**-1.s**-1arith.rate;phys.atmol.collisionaldoubleCR80KCollision rates for T=80K, in cm^3^/molecule/scm**3.mol**-1.s**-1arith.rate;phys.atmol.collisionaldouble