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hal.structure.identifierInstitut de Physique Nucléaire d'Orsay [IPNO]
dc.contributor.authorCHABOT, M.
hal.structure.identifierInstitut des Sciences Moléculaires d'Orsay [ISMO]
dc.contributor.authorBÉROFF, K.
hal.structure.identifierInstitut de RadioAstronomie Millimétrique [IRAM]
dc.contributor.authorGRATIER, P.
dc.contributor.authorJALLAT, A.
hal.structure.identifierAMOR 2013
dc.contributor.authorWAKELAM, Valentine
dc.date.issued2013-07
dc.identifier.issn0004-637X
dc.description.abstractEnThe aim of this paper is to provide a new set of branching ratios (BRs) for interstellar and planetary chemical networks based on a semiempirical model. We applied, instead of zero-order theory (i.e., only the most exoergic decaying channel is considered), a statistical microcanonical model based on the construction of breakdown curves and using experimental high velocity collision BRs for their parameterization. We applied the model to ion-molecule, neutral-neutral, and ion-pair reactions implemented in the few popular databases for astrochemistry, such as KIDA, OSU, and UMIST. We studied the reactions of carbon and hydrocarbon species with electrons, He+, H+, CH+, CH, C, and C+ leading to intermediate complexes of the type C n = 2, 10, C n = 2, 4H, C3H2, C_{n=2,10}^+, C n = 2, 4H+, or C3H_2^+. Comparison of predictions with measurements supports the validity of the model. Huge deviations with respect to database values are often obtained. Effects of the new BRs in time-dependent chemistry for dark clouds and for photodissociation region chemistry with conditions similar to those found in the Horsehead Nebula are discussed.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.subject.enastrochemistry
dc.subject.enastronomical databases: miscellaneous
dc.subject.enISM: abundances
dc.subject.enISM: molecules
dc.title.enReactions Forming C_{n=2,10}^{(0,+)}, C n = 2, 4H(0, +), and C3H_2^{(0,+)} in the Gas Phase: Semiempirical Branching Ratios
dc.typeArticle de revue
dc.identifier.doi10.1088/0004-637X/771/2/90
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.identifier.arxiv1307.0620
bordeaux.journalThe Astrophysical Journal
bordeaux.page90
bordeaux.volume771
bordeaux.peerReviewedoui
hal.identifierhal-00838368
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00838368v1
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