J/ApJ/791/L28ivo://CDS.VizieR/J/ApJ/791/L28doi:10.26093/cds/vizier.17919028CDSZhao D.Doney K.D.Linnartz H.2018-01-22T07:29:59Z2017-03-27T15:11:43ZCDS support team

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

cds-question@unistra.fratomic-physicsThe cyclopropenyl cation (c-C_3_H_3_^+^) is the smallest aromatic hydrocarbon molecule and considered to be a pivotal intermediate in ion-molecule reactions in space. An astronomical identification has been prohibited so far, because of a lack of gas-phase data. Here we report the first high resolution infrared laboratory gas-phase spectrum of the {nu}_4_(C-H asymmetric stretching) fundamental band of c-C_3_H_3_^+^. The c-C_3_H_3_^+^ cations are generated in supersonically expanding planar plasma by discharging a propyne/helium gas pulse, yielding a rotational temperature of ~35 K. The absorption spectrum is recorded in the 3.19 {mu}m region using sensitive continuous-wave cavity ring-down spectroscopy. The analysis of about 130 ro-vibrational transitions results in precise spectroscopic parameters. These constants allow for an accurate comparison with high-level theoretical predictions, and provide the relevant information needed to search for this astrochemically relevant carbo-cation in space.2014ApJ...791L..28Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/791/L28CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/791/L28https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/791/L28http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/791/L28https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/791/L28https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/791/L28http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/791/L28GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/791/L28/table1Wavenumbers of the observed ro-vibrational transitions of the {nu}_4_ fundamental band of c-C_3_H_3_^+^K"Ground state quantum number Kphys.energy;phys.atmol.levelintLSymmGround state level symmetryphys.atmol.paritycharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsObserved wavenumbercm**-1em.freqdoubleo-cObs. - Calc. wavenumbercm**-1em.wavenumberfloatStdDevStandard deviation (1)stat.stdevintAssignAssignmentphys.atmol.configurationcharJ'Upper state rotational quantum number Jphys.atmol.configurationintK'Upper state quantum number Kphys.energy;phys.atmol.levelintl'Upper state lphys.atmol.qncharUSymmUpper state level symmetryphys.atmol.paritycharJ"Ground state rotational quantum number Jphys.atmol.configurationint