J/ApJ/717/674ivo://CDS.VizieR/J/ApJ/717/674doi:10.26093/cds/vizier.17170674CDSKostko O.Zhou J.Sun B.J.Lie J.S.Chang A.H.H.Kaiser R.I.,Ahmed M.2012-07-13T17:11:29Z2012-07-13T16:52:07ZCDS support team

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

cds-question@unistra.fratomic-physicsinterstellar-mediumResults from single photon vacuum ultraviolet photoionization of astrophysically relevant C_n_N clusters, n=4-12, in the photon energy range of 8.0eV-12.8eV are presented. The experimental photoionization efficiency curves, combined with electronic structure calculations, provide improved ionization energies of the CnN species. A search through numerous nitrogen-terminated C_n_N isomers for n=4-9 indicates that the linear isomer has the lowest energy, and therefore should be the most abundant isomer in the molecular beam. Comparison with calculated results also shed light on the energetics of the linear C_n_N clusters, particularly in the trends of the even-carbon and the odd-carbon series. These results can guide the search of potential astronomical observations of these neutral molecules together with their cations in highly ionized regions or regions with a high UV/VUV photon flux (ranging from the visible to VUV with flux maxima in the Lyman-{alpha} region) in the interstellar medium.2010ApJ...717..674Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/717/674CatalogResearchIsServedByTAP VizieR generic servicerelated-toVI/74 : Atomic Energy Level Data (NIST 1993)J/ApJ/688/L83 : Detection of C_5_N^-^ in IRC +10216 (Cernicharo+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/717/674https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/717/674http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/717/674https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/717/674https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/717/674http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/717/674GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/717/674/table2Calculated energies of various isomers of C_n_N (n=1-14)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMolMolecular identification (1)meta.id;phys.molcharn_MolNumber of isomers + vibrational frequencies for this moleculemeta.numberintnullableTermTerm symbol (2)phys.atmol.configurationUB3LYP? B3LYP/cc-pVTZ energy; in Hartree (3)2Ryphys.atmoldoublenullableZPE? Zero-point energy by B3LYP/cc-pVTZ; in Hartree2Ryphys.atmoldoublenullableCCSD(T)? CCSD(T)/cc-pVTZ energy; in Hartree2Ryphys.atmoldoublenullableIE-B? Ionization energy by B3LYP/cc-pVTZ (3)eVphys.energy;phys.atmol.ionizationfloatnullableIE-C? Ionization energy by CCSD(T)/cc-pVTZ (3)eVphys.energy;phys.atmol.ionizationfloatnullableJ/ApJ/717/674/table3Vibrational frequencies and rotational constants of C_n_N (n=3-14) isomers calculated with B3LYP/cc-pVTZMolMolecule name (1)meta.id;phys.molcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_MolNumber of isomers + vibrational frequencies for this moleculemeta.numberintnullableVFreqVibrational frequenciescm**-1phys.atmolcharRotConRotational constantsGHzphys.atmolchar