Xe-Broadened CO Line Shapes in the Fundamental Band at 349 K

Abstract

We present a line shape analysis on the P(2) and P(7) transitions of CO broadened by Xe in the fundamental band. The spectra were recorded at 349 K using a difference frequency laser spectrometer. For line shape analysis, line mixing effects were included and several models describing the Dicke effect were considered. It is shown that retrieved diffusion parameters are pressure dependent and larger than kinetic diffusion parameters. Finally, all these Dicke line shape models fail in the high pressure regime, that rules out the appropriateness of the Dicke effect for the CO‐Xe system.