Measurements of line intensities and line widths in the ν3-fundamental band of nitrous oxide at atmospheric temperatures

Abstract

We present measurements of the absolute intensities, N 2-, O 2-, and air-broadened half-widths of spectral lines in the 4.5 μm ( ν 3-fundamental) band of 14 N 2 16 O at 216, 250 and 296 K . These data were obtained using a high-resolution ( 0.002 cm −1) Fourier-transform spectrometer. The variation of the line widths with temperature and the rotational quantum number m (| m| is J in the P-branch and J+1 in the R-branch, with J being the rotational quantum number of a linear molecule) is examined. Simple empirical polynomial (quartic) fits of the measured half-widths are presented. A new improved method of extrapolation of line-width data to higher values of m has also been devised.