Pressure-broadened infrared linewidths of HF:Ar and HCl:Ar at moderate densities

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Abstract
The widths of several HCl and HF absorption lines broadened by 10 to 140 atm of argon have been measured using a tunable optical parametric oscillator. The lower pressure data yield values for the linear pressure‐broadening coefficients. The data taken at higher densities are used to obtain corrections to the linewidth which are second order in the density. These second density effects are compared with a formal theory for the absorption coefficient at moderate densities due to Albers and Oppenheim, as well as with measurements of the diffusion coefficient obtained in other experiments.