Pressure-induced lineshifts in the 1<-0 band of CO perturbed by He, Ne, Ar, Xe, O-2 and N-2

The pressure-induced shifting coefficients for He-, Ne-, Ar-, Xe-, N-2-, and O-2-broadened lines of CO in the fundamental band have been measured by using a Fourier transform spectrometer. The lineshifts have been determined from the wavenumber differences between the lines of pure CO at low pressure and the pressure broadened lines of CO in mixture with one of the perturbers above mentioned. Comparisons were made with results of theoretical calculations based on a semiclassical model and different isotropic and anisotropic intermolecular potentials. The general trends of the shifts with rotational quantum number are reproduced by the calculations, but not the finer details and the observed asymmetry behavior of the shifts for P and R branches. (C) 1996 Academic Press, Inc.