Abstract
Rotational spectra of both conformers of glyoxal-d1 have been investigated in the 7.8–18 GHz region. The asymmetric isotopic labeling induces in the s-trans conformer a small permanent electric dipole moment. Exploiting the unique properties of a pulsed Fourier transform spectrometer 20 of the extremely weak rotational transitions of s-trans glyoxal-d1 have been observed and assigned. Three rotational constants and four quartic centrifugal distortion constants have been determined from the frequencies of transitions with J≤22. Nuclear quadrupole hyperfine splittings have been resolved for two low J transitions. Approximate values for the quadrupole coupling constants have been obtained therefrom. In addition, 16 transitions of s-cis glyoxal-d1 have been observed and assigned. From the transition frequencies with J≤22 improved rotational constants have been derived along with all quartic centrifugal distortion constants.
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