New insights into collision-induced rototranslational absorption and scattering spectra of gaseous methane at different temperatures

El-Kader, M.S.A.; Maroulis, George

doi:10.1016/j.jms.2012.10.003

Cited by 6 publications

(4 citation statements)

References 109 publications

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“…The CIA of pure CH 4 was investigated experimentally in Codastefano et al 1985, Codastefano et al 1986, Birnbaum 1975and Dagg et al 1986. El-Kader & Maroulis 2012, Borysow & Frommhold 1987aand Borysow & Frommhold 1987b provide examples of theoretical calculations.…”

Section: The Test Cases Of the Cias Of Pure Co 2 Ch 4 And Hmentioning

confidence: 99%

Far infrared measurements of absorptions by CH4 + CO2 and H2 + CO2 mixtures and implications for greenhouse warming on early Mars

Turbet

Tran

Pirali

et al. 2019

Icarus

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We present an experimental study of the absorption, between 40 and 640 cm -1 , by CO 2 , CH 4 and H 2 gases as well as by H 2 +CO 2 and CH 4 +CO 2 mixtures at room temperature. A Fourier transform spectrometer associated to a multi-pass cell, whose optics were adjusted to obtain a 152m path length, were used to record transmission spectra at total pressures up to about 0.98 bar. These measurements provide information concerning the collision-induced absorption (CIA) bands as well as about the wing of the CO 2 15 µm band. Our results for the CIAs of pure gases are, within uncertainties, in agreement with previous determinations, validating our experimental and data analysis procedures. We then consider the CIAs by H 2 +CO 2 and CH 4 +CO 2 and the low frequency wing of the pure CO 2 15 µm band, for which there are, to our knowledge, no previous measurements. We confirm experimentally the theoretical prediction of Wordsworth et al. 2017 that the H 2 +CO 2 and CH 4 +CO 2 CIAs are significantly stronger in the 50-550 cm -1 region than those of H 2 +N 2 and CH 4 +N 2 , respectively. However, we find that the shape and the strength of these recorded CIAs differ from the aforementioned predictions. For the pure CO 2 line-wings, we show that both the factor deduced from measurements near 4 m and a line-mixing model very well describe the observed strongly sub-Lorentzian behavior in the 500-600 cm -1 region. These experimental results open renewed perspectives for studies of the past climate of Mars and extrasolar analogues.

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Section: The Test Cases Of the Cias Of Pure Co 2 Ch 4 And Hmentioning

confidence: 99%

Far infrared measurements of absorptions by CH4 + CO2 and H2 + CO2 mixtures and implications for greenhouse warming on early Mars

Turbet

Tran

Pirali

et al. 2019

Icarus

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“…The agreement with measurements is generally considered as very good, at least in the log-scales used for comparisons of absorption coefficients which vary by several orders of magnitude throughout the considered spectral range. El-Kader and coworkers pursued studies at a similar level of theory for H 2 -(Ar,He) [408,409], CF 4 -He mixtures [410], pure methane [411], pure N 2 [412], and pure O 2 [413]. A classical trajectory study of CIA in CO 2 -(Ar,Xe) mixtures can be found in [414].…”

Section: Standard Binary-collision Treatmentsmentioning

confidence: 99%

Recent advances in collisional effects on spectra of molecular gases and their practical consequences

Hartmann

Tran

Armante

et al. 2018

Journal of Quantitative Spectroscopy and Radiative Transfer

100

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“…CH 4 : lines broadened and shifted by CH 4 and air (E) (Smith et al 2014). CH 4 : collision-induced absorption (T) (El-Kader & Maroulis 2012). CH 4 : lines broadened by CO 2 (E) (Fissiaux et al 2014b).…”

Section: Broadening and Shift Of Molecular Linesmentioning

confidence: 99%

Division B Commission 14 Working Group: Collision Processes

Peach¹,

Dimitrijević²,

Barklem³

2015

Proc. IAU

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Since our last report (Peach & Dimitrijević 2012), a large number of new publications on the results of research in atomic and molecular collision processes and spectral line broadening have been published. Due to the limited space available, we have only included work of importance for astrophysics. Additional relevant papers, not included in this report, can be found in the databases at the web addresses provided in Section 6. Elastic and inelastic collisions between electrons, atoms, ions, and molecules are included, as well as charge transfer in collisions between heavy particles which can be very important.

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New insights into collision-induced rototranslational absorption and scattering spectra of gaseous methane at different temperatures

Cited by 6 publications

References 109 publications

Far infrared measurements of absorptions by CH4 + CO2 and H2 + CO2 mixtures and implications for greenhouse warming on early Mars

Far infrared measurements of absorptions by CH4 + CO2 and H2 + CO2 mixtures and implications for greenhouse warming on early Mars

Recent advances in collisional effects on spectra of molecular gases and their practical consequences

Division B Commission 14 Working Group: Collision Processes

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New insights into collision-induced rototranslational absorption and scattering spectra of gaseous methane at different temperatures

Cited by 6 publications

References 109 publications

Far infrared measurements of absorptions by CH4 + CO2 and H2 + CO2 mixtures and implications for greenhouse warming on early Mars

Far infrared measurements of absorptions by CH4 + CO2 and H2 + CO2 mixtures and implications for greenhouse warming on early Mars

Recent advances in collisional effects on spectra of molecular gases and their practical consequences

Division B Commission 14 Working Group: Collision Processes

Contact Info

Product

Resources

About

Far infrared measurements of absorptions by CH4 + CO2 and H2 + CO2 mixtures and implications for greenhouse warming on early Mars

Far infrared measurements of absorptions by CH4 + CO2 and H2 + CO2 mixtures and implications for greenhouse warming on early Mars