Foreign Gas Broadening of the Lines of Hydrogen Chloride and Carbon Monoxide

The Lorentz line shape formula is applied in the determination of half-width parameters due to foreign gas broadening. Various pressures of S0 2 and C0 2 are added to HCl and CO, respectively. The (1-0) and (2-0) HCl bands, as well as the (2-0) CO band, are investi­ gated, 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 7 0 presented. Some pressure-shifts are observed for HCl, but no quantitative determinations are made.