Abstract
Ground vibrational state rotational transitions have been measured in the frequency region 8 to 220 GHz for the following four isotopic species of cyanoacetylene: H 13CCCN, HC 13CCN, HCC 13CN, and HCCC 15N. The improved rotational constants were used for accurate frequency predictions for any transition not measured in this frequency range. Cyanoacetylene was produced efficiently by a radiofrequency discharge in a mixture of HCCH and HCN; this technique provides a convenient method for specific isotopic enrichment of this molecule.
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