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We have extended to higher frequency our earlier assignments (J. Mol. Spectrosc.162,142–151, 1993) of the dense rotation–torsion structure in theGsmethyl rocking infrared fundamental band of dimethylacetylene (CH3CCCH3or 2-butyne) centered at about 1036 cm−1. TheE2dcombination band ν4+ ν16at 1057 cm−1significantly perturbs this high-frequency structure, and we include its effect explicitly in the...