Lineshape study of the J =3←2 rotational transition of CO perturbed by N 2 and O 2

Priem, D.; Rohart, F.; Colmont, J.-M.; Wlodarczak, G.; Bouanich, Jean-Pierre

doi:10.1016/s0022-2860(99)00268-9

Cited by 120 publications

(140 citation statements)

References 46 publications

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“…In addition, under conditions of low and intermediate ratios of the collisional width, Γ , to the Doppler width, Γ D , the lineshape affected by the speed dependence of collisional broadening can often be well modeled by the Dicke narrowed profile. 41,55 Unfortunately, this treatment leads to a nonlinear pressure dependence of the narrowing parameter Re(ν opt ) 14,56,57 in this intermediate case (i.e., 1 < Γ /Γ D < 5). This nonphysical result can be seen in the R(24) NGP fit shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…It was previously shown that if the interaction potential for the absorber-perturber pair is given by an inverse power relationship, C/r q , the expressions for B S (x) and B W (x) can be written in terms of confluent hypergeometric functions. 35,36 A common quadratic approximation is used to simplify these reduced speed-dependent functions with respect to the speed-dependent width and shift parameters (a W and a S , respectively, which are also used as fitted parameters), 41,42 shown more explicitly as…”

Section: Spectrum Analysismentioning

confidence: 99%

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Observations of Dicke narrowing and speed dependence in air-broadened CO2 lineshapes near 2.06 μm

Bui

Long

Cygan

et al. 2014

The Journal of Chemical Physics

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The line shape problem in the near-infrared spectrum of self-colliding CO 2 molecules: Experimental investigation and test of semiclassical models J. Chem. Phys. 130, 184306 (2009) Frequency-stabilized cavity ring-down spectroscopy was used to study CO 2 lineshapes in the (20013) ← (00001) band centered near 2.06 μm. Two rovibrational transitions were chosen for this study to measure non-Voigt collisional effects for air-broadened lines over the pressure range of 7 kPa-28 kPa. Lineshape analysis for both lines revealed evidence of simultaneous Dicke (collisional) narrowing and speed-dependent effects that would introduce biases exceeding 2% in the retrieved air-broadening parameters if not incorporated in the modeling of CO 2 lineshapes. Additionally, correlations between velocity-and phase/state changing collisions greatly reduced the observed Dicke narrowing effect. As a result, it was concluded that the most appropriate line profile for modeling CO 2 lineshapes near 2.06 μm was the correlated speed-dependent NelkinGhatak profile, which includes all of the physical effects mentioned above and leads to a consistent set of line shape parameters that are linear with gas pressure. © 2014 AIP Publishing LLC.

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Section: Resultsmentioning

confidence: 99%

Section: Spectrum Analysismentioning

confidence: 99%

Observations of Dicke narrowing and speed dependence in air-broadened CO2 lineshapes near 2.06 μm

Bui

Long

Cygan

et al. 2014

The Journal of Chemical Physics

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“…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. Speed dependence of the line-shape parameters was described either in terms of quadratic approximation [33] or with confluent hypergeometric functions [34], which we denote in the profile name abbreviation by subscripts 'q' and 'h', respectively. Unperturbed line positions and collisional shift coefficients derived with all above models were compared to the values extracted by fitting the simple Voigt profile (VP).…”

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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“…(5) development. Moreover, () has an analytical form for a number of line profiles such as Voigt, Galatry, Speed-Dependent Voigt and Speed-Dependent Galatry models [12,[26][27][28][29], including the case of frequency modulated spectral profiles [30]. Of course, the result is not restricted to the 2 nd order low pass filters (or to the 1 st order ones by setting Q = 0), and can be generalized to more complicated detection schemes.…”

Section: B Impact Of the Detection Bandwidth On Recorded Dipole Momementioning

confidence: 99%

Absorption-line-shape recovery beyond the detection-bandwidth limit: Application to the precision spectroscopic measurement of the Boltzmann constant

et al. 2014

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A theoretical model of the influence of detection bandwidth properties on observed line shapes in laser absorption spectroscopy is described. The model predicts artificial frequency shifts, extra broadenings and line asymmetries which must be taken into account in order to obtain accurate central frequencies and other spectroscopic parameters. This reveals sources of systematic effects most probably underestimated so far potentially affecting spectroscopic measurements. This may impact many fields of research, from atmospheric and interstellar physics to precision spectroscopic measurements devoted to metrological applications, tests of quantum electrodynamics or other fundamental laws of nature. Our theoretical model is validated by linear absorption experiments performed on H 2 O and NH 3 molecular lines recorded by precision laser spectroscopy in two distinct spectral regions, nearand mid-infrared. Possible means of recovering original line shape parameters or experimental conditions under which the detection bandwidth has a negligible impact, given a targeted accuracy, are proposed. Particular emphasis is put on the detection bandwidth adjustments required to use such high-quality molecular spectra for a spectroscopic determination of the Boltzmann constant at the 1 ppm level of accuracy.

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Lineshape study of the J =3←2 rotational transition of CO perturbed by N 2 and O 2

Cited by 120 publications

References 46 publications

Observations of Dicke narrowing and speed dependence in air-broadened CO2 lineshapes near 2.06 μm

Observations of Dicke narrowing and speed dependence in air-broadened CO2 lineshapes near 2.06 μm

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

Absorption-line-shape recovery beyond the detection-bandwidth limit: Application to the precision spectroscopic measurement of the Boltzmann constant

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