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The gas-phase chemistry of carbon chains in dark cloud chemical models

hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorLOISON, Jean-Christophe
hal.structure.identifierAMOR 2013
dc.contributor.authorWAKELAM, Valentine
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorHICKSON, Kevin M.
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorBERGEAT, Astrid
dc.contributor.authorMEREAU, Raphael
dc.date.created2013-11-15
dc.date.issued2013
dc.identifier.issn0035-8711
dc.description.abstractEnWe review the reactions between carbon chain molecules and radicals, namely Cn, CnH, CnH2, C2n+1O, CnN, HC2n+1N, with C, N and O atoms. Rate constants and branching ratios for these processes have been re-evaluated using experimental and theoretical literature data. In total 8 new species have been introduced, 41 new reactions have been proposed and 122 rate coefficients from kida.uva.2011 (Wakelam et al. 2012) have been modified. We test the effect of the new rate constants and branching ratios on the predictions of gas-grain chemical models for dark cloud conditions using two different C/O elemental ratios. We show that the new rate constants produce large differences in the predicted abundances of carbon chains since the formation of long chains is less effective. The general agreement between the model predictions and observed abundances in the dark cloud TMC-1 (CP) is improved by the new network and we find that C/O ratios of 0.7 and 0.95 both produce a similar agreement for different times. The general agreement for L134N (N) is not significantly changed. The current work specifically highlights the importance of O + CnH and N + CnH reactions. As there are very few experimental or theoretical data for the rate constants of these reactions we highlight the need for experimental studies of the O + CnH and N + CnH reactions, particularly at low temperature.
dc.language.isoen
dc.publisherOxford University Press (OUP): Policy P - Oxford Open Option A
dc.subject.enAstrophysics
dc.subject.enGalaxy Astrophysics
dc.title.enThe gas-phase chemistry of carbon chains in dark cloud chemical models
dc.typeArticle de revue
dc.identifier.doi10.1093/mnras/stt1956
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv1311.3865
bordeaux.journalMonthly Notices of the Royal Astronomical Society
bordeaux.page930-945
bordeaux.volume437
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-00905547
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00905547v1
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