The ground-state rotational spectrum of protonated cyanogen, HNCCN+, has been identified following the infrared detection by Warner and Amano [J. Mol. Spectrosc. 145, 66 (1991)], using a hollow cathode discharge as production source. The rotational and centrifugal distortion constants have been determined to be 4438.010 13(71) MHz and 0.529 95(24) kHz, respectively.
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Amano et al. (1991) studied this question.
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