Spectral line-shape analysis of CO2 transition using Hartmann-Tran profile and its asymptotic limits

•Hartmann-Tran Profile and its asymptotic limits are studied by analyzing the P 32e line from 12C16O2 band.•The equivalence of asymptotic limits of HTP to their ordinary counterparts are verified.•The fitted partial-correlation coefficient is close to zero with relatively large uncertainty, making t...

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Bibliographic Details
Published in:Journal of molecular spectroscopy 2021-05, Vol.379, p.111480, Article 111480
Main Authors: Li, Dong, Guo, Ruimin, Dong, Hewei
Format: Article
Language:English
Subjects:
Carbon dioxide
Cavity ring-down spectrometer
Hartmann-Tran profile
Line parameters
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Summary:•Hartmann-Tran Profile and its asymptotic limits are studied by analyzing the P 32e line from 12C16O2 band.•The equivalence of asymptotic limits of HTP to their ordinary counterparts are verified.•The fitted partial-correlation coefficient is close to zero with relatively large uncertainty, making the line-narrowing coefficients less reliable. In this paper, the Hartmann-Tran profile (HTP) and its asymptotic limits are employed to analyze the experimentally-measured absorption spectra of CO2 gas. The fitted results by multi-spectrum fitting are compared to those from the ordinary line-shape models. The equivalence and computational efficiency of the asymptotic limits of HTP to their ordinary counterparts are studied. The research shows that the parameters of line position ω0, intensity S, pressure broadening coefficient Γ0/p and shifting coefficient Δ0/p by HTP agree well with those from the speed-dependent hard-collision line-shapes. In comparison, the poorly-determined partial-correlation parameter η makes the fitted line-narrowing parameters less reliable.
ISSN:0022-2852
1096-083X
DOI:10.1016/j.jms.2021.111480