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In the high resolution infrared spectrum of the acetylenic C —H stretch of 1‐butyne, considerable vibrational state mixing is observed. The multiplets of sharp features observed under cooled jet conditions (3 K) are attributed to vibrational state mixing. A dependence of the intramolecular vibrational redistribution (IVR) on the rotational quantum numbers, J and Ka, is found.
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Souza et al. (1988) studied this question.
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