Ground State Centrifugal Distortion Constants of Trans-Acrolein, CH<sub>2</sub> = CH — CHO from the Microwave and Millimeter Wave Rotational Spectra <sup>1,2</sup>

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  • Manfred Winnewisser
    Physikalisch-Chemisches Institut, Justus-Liebig-Universität Giessen, and Max-Planck-Institut für Radioastronomie, Bonn
  • Gisbert Winnewisser
    Physikalisch-Chemisches Institut, Justus-Liebig-Universität Giessen, and Max-Planck-Institut für Radioastronomie, Bonn
  • T. Honda
    Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, Fukuoka, Japan
  • E. Hirota
    Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, Fukuoka, Japan

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<jats:title>Abstract</jats:title> <jats:p> The pure rotational spectrum of trans-acrolein in the ground vibrational state has been assigned in the frequency region from 8 GHz to 180 GHz. The measured absorption lines encompass a-type transitions from the <jats:sup>q</jats:sup>R<jats:sub>K</jats:sub>, <jats:sup>q</jats:sup>Q<jats:sub>1, </jats:sub> <jats:sup>q</jats:sup>Q<jats:sub>2</jats:sub> branches and 6-type transitions from the <jats:sup>r</jats:sup>P<jats:sub>0</jats:sub>, <jats:sup>r</jats:sup>P<jats:sub>1</jats:sub>, <jats:sup>r</jats:sup>P<jats:sub>2</jats:sub>, <jats:sup>r</jats:sup>R<jats:sub>0</jats:sub> brandies for values of J up to 23. The rotational constants have been refined and all quartic and sextic centrifugal distortion constants have been determined using Watson's reduced Hamiltonian. This information has been used to predict line positions of astrophysical interest to warrant the interstellar line search for trans-acrolein.</jats:p>

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