Speed-dependent effects and Dicke narrowing in nitrogen-broadened oxygen

Wójtewicz, Szymon; Masłowski, Piotr; Cygan, A.; Wcisło, Piotr; Zaborowski, Mikołaj; Piwiński, Mariusz; Ciuryło, R.; Lisak, D.

doi:10.1016/j.jqsrt.2015.06.022

Cited by 15 publications

(6 citation statements)

References 62 publications

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“…Since no simple experimental information can be used to correct the calculated speed dependent line shifting of the pcsdKS model, the speed dependence of the line shift is disregarded in the following. Furthermore, as shown in [41,42] for instance, the retrieved quadratic speed-dependent component of the line shift is almost independent on the line-shape model used. Therefore, contrary to the other parameters of the HT profile, this parameter can be easily obtained from fits using the quadratic speed dependent Voigt profile, for instance.…”

Section: The Pcsdks Model the Data Used And The Correction Proceduresmentioning

confidence: 77%

Precise predictions of H 2 O line shapes over a wide pressure range using simulations corrected by a single measurement

Ngo

Nguyễn

2018

Journal of Quantitative Spectroscopy and Radiative Transfer

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In this work, we show that precise predictions of the shapes of H2O rovibrational lines broadened by N2, over a wide pressure range, can be made using simulations corrected by a single measurement. For that, we use the partially-correlated speed-dependent Keilson-Storer (pcsdKS) model whose parameters are deduced from molecular dynamics simulations and semi-classical calculations. This model takes into account the collision-induced velocitychanges effects, the speed dependences of the collisional line width and shift as well as the correlation between velocity and internal-state changes. For each considered transition, the model is corrected by using a parameter deduced from its broadening coefficient measured for a single pressure. The corrected-pcsdKS model is then used to simulate spectra for a wide pressure range. Direct comparisons of the corrected-pcsdKS calculated and measured spectra of 5 rovibrational lines of H2O for various pressures, from 0.1 to 1.2 atm, show very good agreements. Their maximum differences are in most cases well below 1%, much smaller than residuals obtained when fitting the measurements with the Voigt line shape. This shows that the present procedure can be used to predict H2O line shapes for various pressure conditions and thus the simulated spectra can be used to deduce the refined line-shape parameters to complete spectroscopic databases, in the absence of relevant experimental values.

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Section: The Pcsdks Model the Data Used And The Correction Proceduresmentioning

confidence: 77%

Precise predictions of H 2 O line shapes over a wide pressure range using simulations corrected by a single measurement

Ngo

Nguyễn

2018

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…10 showing good agreement with our values. For air-broadened O 2 , the qsdNG profile was used to model the line shape in [36] [14]. Green full squares are results of [36] for the P9P9 line of the B band.…”

Section: The High-order Line-shape Parametersmentioning

confidence: 99%

“…the Galatry profile used in [37,38], the Nelkin-Ghatak profile used in [18] for the A band spectra, the Galatry and NG profiles in [36] for the B band) is shown here. The unique sdNG value of [36] for the P9P9 line of the B band is also plotted in Fig. 11 for comparison.…”

Section: The High-order Line-shape Parametersmentioning

confidence: 99%

“…Magenta triangles and open circles are respectively the theoretically predicted and measured values obtained in[14]. Green full squares are results of[36] for the P9P9 line of the B band.…”

mentioning

confidence: 99%

“…Magenta triangles are the theoretically predicted values obtained in[14]. Green full square is result of[36] for the P9P9 line of the B band. Right panel: The first-order line-mixing parameter for O 2 in air, retrieved from the measured Q lines…”

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confidence: 99%

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High sensitivity spectroscopy of the O2 band at 1.27 µm: (II) air-broadened line profile parameters

Tran

Vasilchenko

Kassi

et al. 2020

Journal of Quantitative Spectroscopy and Radiative Transfer

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A cavity ring down spectrometer referenced to a frequency comb is used to study the profile of air-broadened O2 lines of the 1.27 µm band. To this aim, spectra of O2 in dry air and of O2 in N2 with 2% of O2 were measured, respectively in the 7720-7920 cm−1 and 7868-7887 cm-1 spectral ranges at room temperature and various pressures ranging from 50 to 700 Torr. Detailed line profile analysis is reported for 85 transitions using the speed dependent Nelkin-Ghatak model and a multi-spectrum treatment of the two series of spectra. Line mixing was found necessary to be taken into account in the analysis of lines in the region of the Q branch. The derived line parameters including the broadening and shifting coefficients, the speed dependent components of the collisional line broadening and shifting, as well as the Dicke narrowing parameter are discussed and compared to literature data. In particular, the speed dependence components of the collisional broadening are found to agree satisfactorily with predictions obtained by molecular dynamic simulations. This obtained set of line-shape parameters should allow for improved modeling of atmospheric spectra in the 1.27 um spectral region.

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2021

Collisional Effects on Molecular Spectra

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Speed-dependent effects and Dicke narrowing in nitrogen-broadened oxygen

Cited by 15 publications

References 62 publications

Precise predictions of H 2 O line shapes over a wide pressure range using simulations corrected by a single measurement

Precise predictions of H 2 O line shapes over a wide pressure range using simulations corrected by a single measurement

High sensitivity spectroscopy of the O2 band at 1.27 µm: (II) air-broadened line profile parameters

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