The weakly-bound nitrous oxide–acetylene complex: Fundamental and torsional combination bands of N 2O–C 2H 2 and N 2O–C 2D 2 in the N 2O ν1 region

Abstract

Spectra of the weakly-bound N 2O–C 2H 2 and N 2O–C 2D 2 complexes in the region of the N 2O ν 1 fundamental band (∼2224 cm −1) are observed in a pulsed supersonic slit jet expansion probed with a tunable diode laser. Two bands are analyzed for each complex: the fundamental (N–N stretch), and a combination involving the intermolecular torsional (out-of-plane bend) vibration. The resulting torsional frequencies are 44.37 and 40.01 cm −1 for the C 2H 2 and C 2D 2 complexes, respectively. This represents the first observation of the N 2O–C 2D 2 isotopomer, and the first direct determination of an intermolecular frequency for nitrous oxide–acetylene.