Emission spectra of glyoxal, glyoxal-d 1 , and glyoxal-d 2 have been excited using the various lines of an argon ion laser. The bands have been assigned to 3 band systems, viz. the 1 A u – 1 A g and 3 A u – 1 A g (π*–n) systems of the trans molecule and the 1 B 1 – 1 A 1 (π*–n) system of the cis molecule. The vibrational constants are in good agreement with earlier values. Some new vibrational constants have been determined.
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Dong et al. (1973) studied this question.