Temperature-dependence laws of absorption line shape parameters of the CO2 ν3 band. (February 2018)

• Record Type: Journal Article
• Authors: Wilzewski, J.S.; Birk, M.; Loos, J.; Wagner, G.
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 206(2018)
• Page Start: 296
• Page End: 305
• Publication Date: 2018-02
• Subjects: Temperature-dependence -- Hartmann–Tran profile -- Infrared line shape parameters; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2017.11.021
• Languages: English
• ISSNs: 0022-4073

Abstract

Highlights: Temperature-dependence of non-Voigt parameters studied experimentally over a 140 K temperature range. T-dependence of speed-dependence, γ 2, differs from T-dependence of linewidth, γ 0 . Recommendations given as to which temperature laws should be used for the studied parameters. Rotational quantum number dependence of temperature-dependences obtained. Graphical abstract: Abstract: To improve the understanding of temperature-dependence laws of spectral line shape parameters, spectra of the ν 3 rovibrational band of CO2 perturbed by 10, 30, 100, 300 and 1000 mbar of N2 were recorded at nine temperatures between 190 K and 330 K using a 22 cm long single-pass absorption cell in a Bruker IFS125 HR Fourier Transform spectrometer. The spectra were fitted employing a quadratic speed-dependent hard collision model in the Hartmann–Tran implementation extended to account for line mixing in the Rosenkranz approximation by means of a multispectrum fitting approach developed at DLR. This enables high accuracy parameter retrievals to reproduce the spectra down to noise level and we present the behavior of line widths, shifts, speed-dependence-, collisional narrowing- and line mixing-parameters over this 140 K temperature range.