title: The torsional vibration of the CO2-N2O complex determined from its infrared spectrum.
abstract: The spectra of the weakly bound complex CO(2)-N(2)O are studied in the regions of the nu(1) and nu(3) fundamentals of N(2)O and the nu(3) fundamental of CO(2) using a rapid-scan tunable diode laser spectrometer to probe a pulsed supersonic jet expansion. Five bands are measured and analyzed, of which four have not been previously studied. Two bands at 2225.75 and 1279.58 cm(-1), with a/b-type rotational structure, are assigned to the nu(1) and nu(3) fundamentals of the N(2)O component of the complex. Small perturbations are noted in the nu(3) band, similar to those observed previously for the nonpolar dimer (N(2)O)(2) in the nu(3) and nu(1)+nu(3) regions. The previously known band at 2348.86 cm(-1) in the region of the nu(3) CO(2) stretch is analyzed in improved detail. Weaker c-type bands at 2251.46 and 2374.67 cm(-1) are assigned as combinations of the intermolecular torsional (out-of-plane) vibration plus the N(2)O nu(1) and CO(2) nu(3) stretches, respectively. The resulting torsional frequency of CO(2)-N(2)O is experimentally determined for the first time to be 25.8 cm(-1).
authors.affiliation: Department of Physics and Astronomy, University of Calgary, 2500 University Drive North West, Calgary, Alberta T2N 1N4, Canada.
authors.forename: Mahin
authors.initials: M
authors.lastname: Afshari
authors.forename: M
authors.initials: M
authors.lastname: Dehghany
authors.forename: N
authors.initials: N
authors.lastname: Moazzen-Ahmadi
authors.forename: A R W
authors.initials: AR
authors.lastname: McKellar