Broadening and shift coefficients for the (2←0) overtone band of HCl (1.76 µm) induced by exhaust gases CO and CO₂

We present experimental data on the line pressure broadening and shift coefficients in the first vibrational overtone band of HCl in mixtures with CO and CO₂ gas at room temperature. CO-broadening coefficients are published for the first time. The CO₂-broadening coefficients and shifts for both systems are in very good agreement with the literature data and have better accuracy than earlier results. Collisions with CO₂ lead to stronger broadening for the most lines than collisions with CO. Similar to the broadening coefficients, the absolute values of CO₂-induced shift coefficients are larger than those for HCl-CO system. However, the asymmetric shifts are very similar for both systems except for R₂(0) and P₂(1) lines, where the interaction anisotropy has the strongest influence.