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Measurements of Collisional Broadening Coefficients by Infrared Polarization Spectroscopy

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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 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.

Keywords: CO2; COLLISIONAL BROADENING; LINE SHAPE; POLARIZATION SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370207780466163

Affiliations: 1: School of Chemical Engineering, University of Adelaide, SA, 5005, Australia 2: Division of Combustion Physics, Lund University, P.O. Box 118, SE-22100 Lund, Sweden

Publication date: April 1, 2007

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