On the Speed-Dependent Hard Collision Lineshape Models: Application to C2H2Perturbed by Xe

Lance, Benoit; Blanquet, Ghislain; Walrand, Jacques; Bouanich, Jean-Pierre

doi:10.1006/jmsp.1997.7385

Cited by 178 publications

(91 citation statements)

References 22 publications

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“…Several line-shape models were used in the data analysis, all of which include the Doppler broadening, the collisional broadening and shifting. We also considered the velocity changing collisions in terms of the soft-collision model (the Galatry profile, GP) [28] and the hard-collision model (the Nelkin-Ghatak profile, NGP) [29], as well as their speed-dependent versions: the speeddependent Galatry profile (SDGP) [30] and the speeddependent Nelkin-Ghatak profile (SDNGP) [31], respectively. We additionally tested the speed-dependent Voigt profile (SDVP) [32], which includes the speed dependence of collisional broadening and shifting but neglects the velocity changing collisions.…”

Section: Measurements and Data Analysismentioning

confidence: 99%

Absolute frequency determination of molecular transition in the Doppler regime at kHz level of accuracy

Bielska

Wójtewicz

Morzynski

et al. 2017

Journal of Quantitative Spectroscopy and Radiative Transfer

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We measured absolute frequency of the unperturbed P7 P7 O2 B-band transition ν0 = 434783.5084857(82) GHz and the collisional self-shift coefficient δ = −9.381(62) × 10 −21 GHz/(molecule/cm 3 ). With Doppler-limited spectroscopy we achieved the relative standard uncertainty of 2 × 10 −11 on line position, typical for Doppler-free techniques. Shapes of the spectral line were measured with a Pound-Drever-Hall-locked frequency-stabilized cavity ring-down spectrometer referenced to an 88 Sr optical atomic clock via an optical frequency comb.

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Section: Measurements and Data Analysismentioning

confidence: 99%

Absolute frequency determination of molecular transition in the Doppler regime at kHz level of accuracy

Bielska

Wójtewicz

Morzynski

et al. 2017

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…Details of the functional form and parameters characterizing this model can be found in various studies (e.g., Refs. [28][29][30]. Note that in Refs.…”

Section: B Data Analysismentioning

confidence: 99%

Spectral shapes of Ar-broadened HCl lines in the fundamental band by classical molecular dynamics simulations and comparison with experiments

Doménech

2014

The Journal of Chemical Physics

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Spectral shapes of isolated lines of HCl perturbed by Ar are investigated for the first time using classical molecular dynamics simulations (CMDS). Using reliable intermolecular potentials taken from the literature, these CMDS provide the time evolution of the auto-correlation function of the dipole moment, whose Fourier-Laplace transform leads to the absorption spectrum. In order to test these calculations, room temperature spectra of various lines in the fundamental band of HCl diluted in Ar are measured, in a large pressure range, with a difference-frequency laser spectrometer. Comparisons between measured and calculated spectra show that the CMDS are able to predict the large Dicke narrowing effect on the shape of HCl lines and to satisfactorily reproduce the shapes of HCl spectra at different pressures and for various rotational quantum numbers.

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“…33,52 The physical basis and mathematical form of these line profiles are described in Refs. 41 and 53; therefore, this will be discussed only briefly herein.…”

Section: A Line Profilesmentioning

confidence: 99%

The air-broadened, near-infrared CO2 line shape in the spectrally isolated regime: Evidence of simultaneous Dicke narrowing and speed dependence

Long

Bielska²,

Lisak³

et al. 2011

The Journal of Chemical Physics

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Frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) was employed to measure airbroadened CO 2 line shape parameters for transitions near 1.6 μm over a pressure range of 6.7-33 kPa. The high sensitivity of FS-CRDS allowed for the first measurements in this wavelength range of air-broadened line shape parameters on samples with CO 2 mixing ratios near those of the atmosphere. The measured air-broadening parameters show several percent deviations (0.9%-2.7%) from values found in the HITRAN 2008 database. Spectra were fit with a variety of models including the Voigt, Galatry, Nelkin-Ghatak, and speed-dependent Nelkin-Ghatak line profiles. Clear evidence of line narrowing was observed, which if unaccounted for can lead to several percent biases. Furthermore, it was observed that only the speed-dependent Nelkin-Ghatak line profile was able to model the spectra to within the instrumental noise level because of the concurrent effects of collisional narrowing and speed dependence of collisional broadening and shifting.

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On the Speed-Dependent Hard Collision Lineshape Models: Application to C2H2Perturbed by Xe

Cited by 178 publications

References 22 publications

Absolute frequency determination of molecular transition in the Doppler regime at kHz level of accuracy

Absolute frequency determination of molecular transition in the Doppler regime at kHz level of accuracy

Spectral shapes of Ar-broadened HCl lines in the fundamental band by classical molecular dynamics simulations and comparison with experiments

The air-broadened, near-infrared CO2 line shape in the spectrally isolated regime: Evidence of simultaneous Dicke narrowing and speed dependence

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