J/A+A/564/A82ivo://CDS.VizieR/J/A+A/564/A82doi:10.26093/cds/vizier.35640082CDSCarles S.Mollendal H.Trolez Y.Guillemin J.-C.2014-10-04T07:56:03Z2014-04-10T08:36:49ZCDS support team

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

cds-question@unistra.fratomic-physicsA successful identification of an interstellar compound requires that its spectrum has first been assigned in the laboratory. New and sensitive radiotelescopes, such as ALMA, will make it possible to detect interstellar molecules in much smaller concentrations than before. Cyanoallene (CH_2_=C=CH-CN) has recently been observed in the dense molecular cloud TMC-1 by means of its rotational spectrum. Its methyl congener, 4-methylcyanoallene (CH_3_CH=C=CH-CN), may also be present in the interstellar medium (ISM). This chiral compound exists in two forms, which are mirror images. Chirality is an essential feature of life. So far, no chiral compounds have been detected in the ISM. The synthesis and assignment of the rotational spectrum of CH_3_CH=C=CH-CN, will facilitate the potential detection of this compound in the ISM.2014A&A...564A..82Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/564/A82CatalogResearchIsServedByTAP 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)J/A+A/558/A6 : Microwave spectra EtCCCN (C2H5CCCN) (Carles+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/564/A82https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/564/A82http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/564/A82https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/564/A82https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/564/A82http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/564/A82GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/564/A82/table3Rotational spectrum of CH_3_CH=C=CH-CN in the ground vibrational staterecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJu[5/52] Transition J of the upper level (1)meta.noteintK-1u[0/30] Transition K-1 of the upper levelphys.mol.qnintK+1u[3/50] Transition K+1 of the upper levelphys.mol.qnintJl[6/52] Transition J of the lower levelmeta.noteintK-1l[0/30] Transition K-1 of the lower levelphys.mol.qnintK+1l[4/49] Transition K+1 of the lower levelphys.mol.qnintFreq[18124/114662] Observed frequencyMHzem.freqdoublee_Freq[-0.6/0.5] Estimated uncertainties of the observed frequencies (G1)MHzstat.errorfloatO-C[-0.6/0.5] Observed minus Calculated residualMHzstat.fit.residualfloatt[-2/2] Student's t-teststat.fit.paramfloatCorrT[-328/1310] Total Distortion Corrections: correction from quartic and sextic (if included) centrifugal distortion constantsMHzphys.atmoldoubleCorrH[-68/1.4] Higher Distortion Corrections: contribution from sextic centrifugal distortion constantsMHzphys.atmoldoubleEu[64328/11883000] Upper energyMHzphys.energy;phys.atmol.leveldoubleJ/A+A/564/A82/table4Rotational spectrum of CH_3_CH=C=CH-CN in the lowest vibrationally excited staterecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJu[5/36] J of the upper level (1)meta.noteintK-1u[0/15] K-1 of the upper levelphys.mol.qnintK+1u[4/35] K+1 of the upper levelphys.mol.qnintJl[6/37] J of the lower levelmeta.noteintK-1l[0/15] K-1 of the lower levelphys.mol.qnintK+1l[5/36] K+1 of the lower levelphys.mol.qnintFreq[18170/114618] Observed frequencyMHzem.freqdoublee_Freq[0.1/0.25] Estimated uncertainties of the observed frequencies (G1)MHzstat.errorfloatO-C[-0.6/0.7] Observed minus Calculated residualsMHzstat.fit.residualfloatt[-2/2.6] Student's t-teststat.fit.paramfloatCorrT[-130/240] Total Distortion Corrections: correction from quartic and sextic (if included) centrifugal distortion constantsMHzphys.atmoldoubleCorrH[-2.7/0.95] Higher Distortion Corrections: contribution from sextic centrifugal distortion constantsMHzphys.atmoldoubleCorrF[-0.5/0.95] Fixed Distortion Corrections: contribution from fixed quartic and/or fixed sextic centrifugal distortion constantsMHzphys.atmoldouble