J/A+A/558/A6ivo://CDS.VizieR/J/A+A/558/A6doi:10.26093/cds/vizier.35580006CDSCarles S.Mollendal H.Guillemin J.-C.2014-06-23T07:08:09Z2014-01-03T10:27:24ZCDS support team

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

cds-question@unistra.fratomic-physicsinterstellar-mediumNew radiotelescopes, such as the very sensitive ALMA, will enable the detection of interstellar molecules in much lower concentrations than previously possible. A successful identification of an interstellar molecule requires that laboratory microwave and millimeter-wave spectra are investigated. Several cyanopolyynes and alkynylcarbonitriles have already been detected in the interstellar medium (ISM). Cyanoacetylene (HCCCN) is abundant in the ISM and its methyl derivative, 2-butynenitrile (CH3CCCN), is also present. The next derivative, ethyl cyanoacetylene, (2-pentynenitrile C_2_H_5_CCCN) may also be present in interstellar space. We report the rotational spectrum of the ethyl cyanoacetylene (C_2_H_5_CCCN). This is hoped to facilitate identifying gaseous ethyl cyanoacetylene in the ISM.2013A&A...558A...6Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/558/A6CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/466/255 : Isotopic ethyl cyanide (Demyk+, 2007)J/A+A/493/565 : Deuterated and ^15^N ethyl cyanides (Margules+, 2009)J/ApJ/714/476 : Complete spectrum of ethyl cyanide (Fortman+, 2010)J/ApJS/184/133 : New ground-state measurements of ethyl cyanide (Brauer+, 2009)J/A+A/543/A135 : New analysis of ^13^C-CH_3_CH_2_CN up to 1THz (Richard+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/558/A6https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/558/A6http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/558/A6https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/558/A6https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/558/A6http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/558/A6GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/558/A6/table6Rotational spectrum of C_2_H_5_CCCNrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJu[3/43] Transition J of the upper level (1)phys.atmol.levelintK-1u[0/17] Transition K-1 of the upper levelphys.atmol.levelintK+1u[2/36] Transition K+1 of the upper levelphys.atmol.levelintJl[4/44] Transition J of the lower levelphys.atmol.levelintK-1l[0/17] Transition K-1 of the lower levelphys.atmol.levelintK+1l[3/37] Transition K+1 of the lower levelphys.atmol.levelintFreq[10402/115955] Observed frequencyMHzem.freqdoubleO-C[-0.4/0.3] Observed minus calculated residualsMHzstat.fit.residualfloatWeightEstimated uncertainties of the observed frequencies (2)MHzstat.errorfloattStudent's t-testphys.atmolfloatCorrTTotal distortion corrections from quartic and sextic (if included) centrifugal distortion constantsMHzarith.factor;phot.fluxfloatCorrHHigher distortion corrections, contribution from sextic centrifugal distortion constantsMHzarith.factor;phot.fluxdouble