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Measurements of Collisional Broadening Coefficients by Infrared Polarization Spectroscopy
Volume 61, Number 4 (April 2007) Page 424-427
Alwahabi, Z.T.; Zetterberg, J.; Li, Z.S.; Aldén, M.
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 CO2-Ar and CO2-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 CO2 by Ar and He, for the R14 (12°1 ← 00°0) line, have been determined to be 0.161 ± 0.018 cm−1 atm−1 and 0.1823 ± 0.0032 cm−1 atm−1, respectively.