Characterization of line mixing effects in the 11101←00001 band of carbon dioxide for pressures up to 19 atm. (September 2021)

• Record Type: Journal Article
• Authors: Predoi-Cross, Adriana; Buldyreva, Jeanna
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 272(2021)
• Publication Date: 2021-09
• Subjects: Carbon dioxide -- Non-Markovian Energy Corrected Sudden modeling -- Exponential Power Gap scaling law -- Fourier transform spectra -- Line mixing; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2021.107793
• Languages: English
• ISSNs: 0022-4073

Abstract

Highlights: We analyzed the weak and full line mixing for transitions of the 11 1 01 ← 00 0 01 band. The theoretical profiles were modeled with the Energy-Corrected-Sudden model. The experimental weak line mixing coefficients were modeled using EPG, ECS laws. Comparisons with results available in the literature were presented and discussed. Abstract: Fourier-transform spectra of room-temperature carbon dioxide compressed to pressures up to 19 atm reported previously are re-analyzed to obtain weak line-mixing parameters and a representation of full line mixing for transitions observed in the P- and Q-branches of the 11101 ← 00001 (Π ← Σ) band centered at 2076.86 cm −1 . Similar analyses for the R-branch transitions are prevented by strong Coriolis resonances that nearly completely transfer the intensities of R-branch transitions to the P-branch. The weak line mixing coefficients are retrieved experimentally and are modeled using the Exponential Power Gap scaling law. Another modeling is performed with an Energy-Corrected-Sudden type approach making use of a symmetric relaxation matrix satisfying all basic relations. Comparisons of experimental and calculated parameters with results available in the literature are presented and discussed. Graphical abstract: ECS-modeled versus measured transmittances at the pressure of 0.962 atm for the CO2 bands studied in this work Image, graphical abstract