Foreign gas broadening of the lines of hydrogen chloride and carbon monoxide

Abstract

The Lorentz line shape formula is applied in the determination of half-width parameters due to foreign gas broadening. Various pressures of SO₂ and CO₂ are added to HCl and CO, respectively. The (1–0) and (2–0) HCl bands, as well as the (2–0) CO band, are investigated, and there is found to be a very definite relationship between the half-width and the rotational quantum number, J. No error of more than 5 percent should be expected for the values of γ⁰ presented. Some pressure-shifts are observed for HCl, but no quantitative determinations are made.