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Einstein A-coefficients for vib-rotational transitions in CO isotopomers, for vibrational quantum number v up to 20, rotational quantum number J up to 140, and up to 4, are calculated. The change in J is governed by the selection rules . These coefficients play an important role in astronomy, as CO is the most abundant molecule after , and has been observed in almost all the astronomical objects.
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Chandra et al. (1996) studied this question.
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