Rotational spectroscopy of isotopic oxirane, $c$-C${}_2$H${}_4$O

Abstract

We studied the rotational spectrum of oxirane in a sample of natural isotopic composition in selected regions between 158 GHz and 1093 GHz. Investigations of the isotopologs with one ${}^{13}$C or one ${}^{18}$O were the primary focus in order to facilitate searches for them in space. We also examined the main isotopic species mainly to look into the performance of Watson's A and S reductions both in an oblate and in a prolate representation. Even though oxirane is a rather asymmetric oblate rotor, the A reduction in the III${}^l$ representation did not yield a satisfactory fit, as was observed frequently earlier for other molecules. The other three combinations yielded satisfactory fits of similar quality among each other; the A reduction in the I${}^r$ representation required two parameters less than both S reduction fits.

11 pages, including tables and figure; minor update; J. Mol. Spectrosc., published

References in corpus (4)

• The largest oxigen bearing organic molecule repository
• Discovery of HC4NC in TMC-1: A study of the isomers of HC3N, HC5N, and HC7N
• First detection of 13CH in the interstellar medium
• Rotational spectroscopy of isotopic cyclopropenone, $c$-H${}_2$C${}_3$O, and determination of its equilibrium structure

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• The salty emission of the intermediate-mass AGB star OH 30.1 -0.7
• Investigation of the rotational spectrum of CH${}_3$${}^{17}$OH and its tentative detection toward Sagittarius B2(N)