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Lisak, D.; Masłowski, Piotr; Cygan, A.; Bielska, Katarzyna; Wójtewicz, Szymon; Piwiński, Mariusz; Hodges, Joseph T.; Trawiński, R. S.; Ciuryło, R.

doi:10.1103/physreva.81.042504

Cited by 41 publications

(44 citation statements)

References 71 publications

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“…Specifically, the collisional narrowing frequency is given by ν nar = ηp in which η is the collisional narrowing parameter, whereas the quadratic approximation speed-dependent parameters a w and a s are independent of pressure. 64 Thus, we have utilized multi-spectrum fitting 44,45 to simultaneously fit spectra across a given range of pressures. This multi-spectrum fitting procedure produces a single value for each of the narrowing and asymmetry parameters (i.e., η, a w , and a s ).…”

Section: Resultsmentioning

confidence: 99%

“…As previously demonstrated, the sensitivity and spectral fidelity of FS-CRDS make it an ideal technique for detailed study of subtle line shape effects. [36][37][38][39][40][41][42][43] Furthermore, the use of multi-spectrum fitting, [44][45][46] which simultaneously fits spectra across a wide pressure range, can enable the collisional narrowing and speed-dependent effects to be separated and quantified. Below, we present FS-CRDS line shape measurements of an air-broadened near-infrared CO 2 transition near 6360 cm −1 , and we compare our measured Lorentzian broadening parameters to literature values.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

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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show abstract

“…In some oxygen line-shape studies, transitions have been analysed using Galatry [19][20][21][22][23][24][25][26] or Rautian [22,23,26] profiles thus taking into account only VC but disregarding the effects of SD. The opposite assumption has also been made; the speed-dependent Voigt model being thus used while effects of VC are disregarded [22,[25][26][27]. Several alternative line shapes based on combinations of various VC and SD models have also been tested, as in [25,26].…”

Section: Introductionmentioning

confidence: 99%

Isolated line shapes of molecular oxygen: Requantized classical molecular dynamics calculations versus measurements

et al. 2014

Self Cite

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We present comparisons between measured isolated line shapes of molecular oxygen in air at various pressures and those calculated, free of any adjusted parameter, using requantized classical molecular dynamics simulations (rCMDS). The measurements have been made for the R1Q2, P9P9, P11P11, P13P13, and P15Q14 transitions in the O 2 singlet-band [a 1 g ← X 3 − g (0,0)] by the frequency-stabilized cavity ring-down spectroscopy technique. This work extends a previous study made for a single oxygen line [Phys. Rev. A 87, 032510 (2013)] and confirms the quality of this theoretical approach over broad ranges of pressure and rotational quantum number. Indeed, not only the collisional broadening coefficients but also the (small) deviations of observed line shapes with respect to the Voigt profile are accurately predicted. These results illustrate the viability of using the rCMDS method as a benchmark for the development and testing of simpler parametrized line profiles that are suitable for the analysis of underlying physical mechanisms and for atmospheric remote sensing applications.

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“…It for instance, constituted 97% of the 144 ppm standard uncertainty published in [29]. The influence of the lineshape model on the spectroscopic determination of the Boltzmann constant has been raised by us and other groups working with O 2 and H 2 O [29,32,[40][41][42][43][44][45]. We recently carried out an extensive lineshape study at relatively high pressure in SPC, in order to enhance collisional effects and to determine the most suitable model for our data [40].…”

Section: The Lineshape Problemmentioning

confidence: 99%

Accurate determination of the Boltzmann constant by Doppler spectroscopy: Towards a new definition of the kelvin

Darquié

Mejri

Sow

et al. 2013

EPJ Web of Conferences

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Abstract. Accurate molecular spectroscopy in the mid-infrared region allows precision measurements of fundamental constants. For instance, measuring the linewidth of an isolated Doppler-broadened absorption line of ammonia around 10 m enables a determination of the Boltzmann constant k B . We report on our latest measurements. By fitting this lineshape to several models which include Dicke narrowing or speeddependent collisional effects, we find that a determination of k B with an uncertainty of a few ppm is reachable. This is comparable to the best current uncertainty obtained using acoustic methods and would make a significant contribution to any new value of k B determined by the CODATA. Furthermore, having multiple independent measurements at these accuracies opens the possibility of defining the kelvin by fixing k B , an exciting prospect considering the upcoming redefinition of the International System of Units.

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Line shapes and intensities of self-broadenedO2b1

Cited by 41 publications

References 71 publications

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

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

Isolated line shapes of molecular oxygen: Requantized classical molecular dynamics calculations versus measurements

Accurate determination of the Boltzmann constant by Doppler spectroscopy: Towards a new definition of the kelvin

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