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The pure rotational spectra of [ 18 O]ketene, H 2 C=C 18 O, [1- 13 C]ketene, H 2 C= 13 CO, and [2- 13 C]ketene, H 2  13 C=CO, have been revisited in the frequency region 200 - 350 GHz in the ground vibrational state.

The Rotational Spectrum of Ketene Isotopomers with 18 O and 13 C Revisited