J/A+A/647/A55ivo://CDS.VizieR/J/A+A/647/A55doi:10.26093/cds/vizier.36470055CDSAlonso E.R.Kolesnikova L.Belloche A.Mata S.Garrod R.T.Jabri A.,Leon I.Guillemin J.-C.Mueller H.S.P.Menten K.M.Alonso J.L.2021-07-05T08:31:43Z2021-03-09T08:21:28ZCDS support team

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

cds-question@unistra.frinterstellar-mediumspectroscopyatomic-physicsFor all the amides detected in the interstellar medium (ISM), the corresponding nitriles or isonitriles have also been detected in the ISM, some of which have relatively high abundances. Among the abundant nitriles for which the corresponding amide has not yet been detected is cyanoacetylene (HCCCN), whose amide counterpart is propiolamide (HCCC(O)NH_2_). With the aim of supporting searches for this amide in the ISM, we provide a complete rotational study of propiolamide from 6GHz to 440GHz. Time-domain Fourier transform microwave (FTMW) spectroscopy under supersonic expansion conditions between 6GHz and 18GHz was used to accurately measure and analyze ground-state rotational transitions with resolved hyperfine structure arising from nuclear quadrupole coupling interactions of the 14N nucleus. We combined this technique with the frequency-domain roomtemperature millimeter wave and submillimeter wave spectroscopies from 75GHz to 440GHz in order to record and assign the rotational spectrain the ground state and in the low-lying excited vibrational states. We used the ReMoCA spectral line survey performed with the Atacama Large Millimeter/submillimeter Array toward the star-forming region Sgr B2(N) to search for propiolamide. We identified and measured more than 5500 distinct frequency lines of propiolamide in the laboratory. These lines were fitted using an effective semi-rigid rotor Hamiltonian with nuclear quadrupole coupling interactions taken into consideration. We obtained accurate sets of spectroscopic parameters for the ground state and the three low-lying excited vibrational states. We report the nondetection of propiolamide toward the hot cores Sgr B2(N1S) and Sgr B2(N2). We find that propiolamide is at least 50 and 13 times less abundant than acetamide in Sgr B2(N1S) and Sgr B2(N2), respectively, indicating that the abundance difference between both amides is more pronounced by at least a factor of 8 and 2, respectively, than for their corresponding nitriles. Although propiolamide has yet to be included in astrochemical modeling networks, the observed upper limit to the ratio of propiolamide to acetamide seems consistent with the ratios of related species as determined from past simulations. The comprehensive spectroscopic data presented in this paper will aid future astronomical searches.2021A&A...647A..55Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/647/A55CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/158/188 : Detection of glycolaldehyde toward Sgr B2 (Widicus+, 2005)J/A+A/559/A47 : Sgr B2(N) and Sgr B2(M) IRAM 30m line survey (Belloche+, 2013)J/ApJ/812/L5 : CH_3_NCO (methyl isocyanate) transition frequenciesJ/A+A/610/A10 : Sgr B2 los molecular absorption line spectra (Corby+, 2018)J/A+A/639/A135 : Glycolamide rotational transitions (Sanz-Novo+, 2020)J/A+A/641/A160 : Hot aminoacetonitrile in Sgr B2 (Melosso+, 2020)J/A+A/642/A29 : Spectroscopy of CH2(CN)2 and CNCH2CN (Motiyenko+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/647/A55https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/647/A55http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/647/A55https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/647/A55https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/647/A55http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/647/A55GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/647/A55/table2Fitted rotational transitions of propiolamide in the ground state and three excited vibrational statesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVibStateVibrational statephys.atmol.configurationcharJ'Upper state J quantum numberphys.atmol.configurationintKa'Upper state Ka quantum numberphys.mol.qnintKc'Upper state Kc quantum numberphys.mol.qnintF'? Upper state F quantum numberphys.mol.qnintnullableJ"Lower state J quantum numberphys.atmol.configurationintKa"Lower state Ka quantum numberphys.mol.qnintKc"Lower state Kc quantum numberphys.mol.qnintF"? Lower state F quantum numberphys.mol.qnintnullableFreqObsObserved transition frequencyMHzem.freqdoublee_FreqExperimental uncertaintyMHzstat.errorfloatO-CObserved minus calculated frequencyMHzstat.fit.residualfloatCommentSource of the data (1)meta.notechar