Abstract
Infrared spectrum of the weakly-bound CO 2–C 2H 2 complex in the region of the CO 2 ν 3 fundamental band (∼2349 cm −1) is observed in a pulsed supersonic slit jet expansion using a tunable diode laser probe. Two bands are observed and analyzed: the fundamental (C–O asymmetric stretch) and a combination involving the intermolecular torsional (out-of-plane bend) vibration. The resulting torsional frequency is 44.385(10) cm −1. This represents the first observation of an intermolecular frequency for carbon dioxide–acetylene complex. A comparison between the results obtained here and those previously reported for N 2O–C 2H 2 complex is discussed.
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