Application of the Hartmann–Tran profile to precise experimental data sets of 12C2H2

Forthomme, Damien; Cich, Matthew J.; Twagirayezu, Sylvestre; Hall, Gregory E.; Sears, Trevor J.

doi:10.1016/j.jqsrt.2015.06.013

Cited by 22 publications

(13 citation statements)

References 41 publications

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“…In this particular case, it was shown [181] that the ratio of the broadening speed-dependence parameter to the pressure-broadening coefficient should be independent of T. This result was experimentally confirmed to within a few percent for variable-temperature measurements of CO 2 line shapes in the 1.6 m region [181]. However, some other experimental studies [103,[182][183][184] have shown that the temperature dependences of the line broadening and of its quadratic speed-dependent component are significantly different. For the Dicke-narrowing parameter (generally denoted by  VC ), a power law for its temperature dependence was used in a few studies (eg [103,182,185,186]) that have investigated this issue.…”

Section: 24b Temperature Dependence Of the Line-shape Parametersmentioning

confidence: 60%

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

102

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Section: 24b Temperature Dependence Of the Line-shape Parametersmentioning

confidence: 60%

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

102

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“…The details of the RP and GP calculations can be found in the paper by Wang et al [30]. HTP was calculated according to Forthomme et al [31], who provide the Matlab implementation as a supplement to the paper.…”

Section: Experimental Results and Modelling Of The H2 Lineshapementioning

confidence: 99%

Hydrogen Sensor Based on Tunable Diode Laser Absorption Spectroscopy

Avetisov

Bjoroey

Wang

et al. 2019

Sensors

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A laser-based hydrogen (H2) sensor using wavelength modulation spectroscopy (WMS) was developed for the contactless measurement of molecular hydrogen. The sensor uses a distributed feedback (DFB) laser to target the H2 quadrupole absorption line at 2121.8 nm. The H2 absorption line exhibited weak collisional broadening and strong collisional narrowing effects. Both effects were investigated by comparing measurements of the absorption linewidth with detailed models using different line profiles including collisional narrowing effects. The collisional broadening and narrowing parameters were determined for pure hydrogen as well as for hydrogen in nitrogen and air. The performance of the sensor was evaluated and the sensor applicability for H2 measurement in a range of 0–10 %v of H2 was demonstrated. A precision of 0.02 %v was achieved with 1 m of absorption pathlength (0.02 %v∙m) and 1 s of integration time. For the optimum averaging time of 20 s, precision of 0.005 %v∙m was achieved. A good linear relationship between H2 concentration and sensor response was observed. A simple and robust transmitter–receiver configuration of the sensor allows in situ installation in harsh industrial environments.

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“…The temperature dependences of the pressure broadening and shifting parameters are usually described by a power law and a linear function (see Gordon et al, , and references therein), respectively. For the higher‐order parameters, their temperature dependences have been investigated only in a few studies (e.g., Forthomme et al, ; Goldenstein & Hanson, ; Li et al, ; Wilzewski et al, ). These studies showed that Γ 2 ( T ) and ν vc ( T ) as well as ζ ( T ) can be described by a similar power law as for the line broadening.…”

Section: Spectra Analysis and Resultsmentioning

confidence: 99%

Measurement and Modeling of Air‐Broadened Methane Absorption in the MERLIN Spectral Region at Low Temperatures

et al. 2019

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The ability to precisely model methane absorption in the R(6) manifold of the 2ν3 band at atmospheric pressure and temperature conditions is a key technical requirement of the German‐French, Methane Remote Sensing Lidar (MERLIN) space mission. To this end, 27 high‐resolution and high‐signal‐to‐noise‐ratio absorption spectra of air‐broadened 12CH4 were recorded using a variable‐temperature frequency‐stabilized cavity ring‐down spectroscopy apparatus. The measurement conditions corresponded to sample temperature, pressure, and methane molar fraction values spanning 220–290 K, 4–110 kPa, and 4–7 μmol/mol, respectively. The measured spectra were fit using the sum of isolated Hartmann‐Tran profiles with the addition of line mixing. For each line within the manifold, all spectroscopic parameters at room temperature were fixed to our previously obtained values (Delahaye et al., 2016, https://doi.org/10.1002/2015JD024524) and only the temperature dependences of the model parameters were adjusted. The results show that the fitted model agrees with the measured methane absorption to better than 0.3% for the entire R(6) manifold spectral region and to within 0.1% at the online position of the MERLIN for all considered pressure and temperature conditions. A first comparison with ground‐based atmospheric measurement was also made showing significant improvement with respect to existing spectroscopic modeling of methane absorption.

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Application of the Hartmann–Tran profile to precise experimental data sets of 12C2H2

Cited by 22 publications

References 41 publications

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

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

Hydrogen Sensor Based on Tunable Diode Laser Absorption Spectroscopy

Measurement and Modeling of Air‐Broadened Methane Absorption in the MERLIN Spectral Region at Low Temperatures

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