Abstract
We present measurements of collisional broadening coefficients, obtained at atmospheric pressure, by polarization spectroscopy. Using tunable single mode laser radiation at ∼2 μm, high-resolution infrared polarization spectra were recorded for CO<sub>2</sub>–Ar and CO<sub>2</sub>–He binary mixtures. The recorded polarization spectra were fitted with a Lorentzian cubed function form to obtain the broadening coefficients. The full-width at half-maxima (FWHM) collisional broadening rates of CO<sub>2</sub> by Ar and He, for the R14 (12°1 ← 00°0) line, have been determined to be 0.161 ± 0.018 cm<sup>−1</sup> atm<sup>−1</sup> and 0.1823 ± 0.0032 cm<sup>−1</sup> atm<sup>−1</sup>, respectively.
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