Collisional line shifting and broadening in the fundamental P-branch of CO in Ar between 214 and 324K

Wehr, Richard; Vitcu, A.; Thibault, Franck; Drummond, J. R.; May, A. D.

doi:10.1016/j.jms.2005.10.004

Cited by 26 publications

(9 citation statements)

References 27 publications

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“…The He-broadening of CO transitions was also extensively studied [4,5,8,13,[15][16][17][18][19][20][21][22][23][24][25] because this case is relevant to determining the composition of interstellar molecular clouds and the atmospheres of the outer planets. Also, many other rare gases have been considered as collision partners to investigate how CO line shapes depend on the perturber-to-absorber mass ratio [4,5,7,13,16,19,20,23,[26][27][28][29][30][31][32][33][34][35][36]. All of these studies indicate that measured CO line shapes deviate from the often-used Voigt profile.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, in Refs. [31,32] the speed dependent billiard-ball model was compared to measured spectra of CO in Ar. This analysis requires accurate calculations for the speed dependent width and shift and assumes a hard-sphere model for velocitychanging collisions.…”

Section: Introductionmentioning

confidence: 99%

“…This analysis requires accurate calculations for the speed dependent width and shift and assumes a hard-sphere model for velocitychanging collisions. Although leading to very good agreement with measured spectra [32], this model is too computationally intensive and unsuitable for applications such as radiative transfer calculations.…”

Section: Introductionmentioning

confidence: 99%

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Spectral shapes of rovibrational lines of CO broadened by He, Ar, Kr and SF6: A test case of the Hartmann-Tran profile

Ngo

Lin

Hodges

2017

Journal of Quantitative Spectroscopy and Radiative Transfer

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High signal-to-noise ratio spectra of the (3-0) band P(1) and P(17) lines of CO broadened by He, Ar, Kr and SF 6 were measured with a frequency-stabilized cavity ring-down spectroscopy system. For each collision-partner and both lines, multiple spectra were measured over pressures spanning nearly three decades up to 130 kPa. These data were analyzed with a multispectrum fitting procedure. Line shapes were modeled using the Hartmann-Tran (HT) profile with first-order line mixing as well as several other simplified profiles. The results show that for all considered collision partners (with the exception of SF 6), the HT profile captures the measured line shapes with maximum absolute residuals that are within 0.1% of the peak absorption. In the case of SF 6 , which is the heaviest perturber investigated here, the maximum residuals for the HT profile are twice as large as for the other collision partners.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectral shapes of rovibrational lines of CO broadened by He, Ar, Kr and SF6: A test case of the Hartmann-Tran profile

Ngo

Lin

Hodges

2017

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…A number of potential energy surfaces for Ar-CO have been published [1,[20][21][22][23][24], and used to predict results to compare with a variety of experiments, including studies on the collisional line broadening of CO in Ar [10][11][12]25,26] and spectroscopic studies of the Ar-CO van der Waals complex [27][28][29][30]. Havenith and Schwaab summarized many of these studies in their 2005 review article [1].…”

Section: Introductionmentioning

confidence: 99%

Rotational energy transfer in collisions between CO and Ar at temperatures from 293 to 30 K

Mertens

Labiad

Denis-Alpizar

et al. 2017

Chemical Physics Letters

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Experimental measurements and theoretical calculations are reported for rotational energy transfer in the Ar-CO system. Experiments were performed in cold uniform supersonic flows of Ar, using an infrared -vacuum ultraviolet double resonance technique to measure absolute state-to-state rate constants and total relaxation cross sections for rotational energy transfer within the (v = 2) vibrational state of CO in collision with Ar at temperatures from 30.5 to 293 K. Close-coupled calculations were also performed using a recent potential energy surface (Y. Sumiyoshi and Y. Endo, J. Chem. Phys. 142 (2015) 024314). Very good agreement is obtained between measured and calculated values.

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“…It should be mentioned that other recent theoretical work has explicitly included treatment of speed-dependent collision rates and velocity changing collisions, along with broadening and shifting of the lines [19,20,21]. This paper is organized as follows: Section 2.1 presents a brief review of time-independent quantum scattering calculation of pressure broadening cross sections, while Sec.…”

Section: Introductionmentioning

confidence: 99%

Pressure broadening calculations for OH in collisions with argon: Rotational, vibrational, and electronic transitions

Dagdigian

2017

Journal of Quantitative Spectroscopy and Radiative Transfer

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Collisional parameters describing both the pressure-induced broadening and shifting of isolated lines in the spectrum of the hydroxyl radical in collisions with argon have been determined through quantum scattering calculations using accurate potential energy surfaces describing the OH(X 2 Π,A 2 Σ + )-Ar interactions. These calculations have been carried for pure rotational, vibrational, and electronic transitions. The calculated pressure broadening coefficients are in good agreement with the available measurements in the microwave, infrared, and ultraviolet spectral regions. Computed pressure broadening coefficients as a function of temperature are reported for these three types of transitions.

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Collisional line shifting and broadening in the fundamental P-branch of CO in Ar between 214 and 324K

Cited by 26 publications

References 27 publications

Spectral shapes of rovibrational lines of CO broadened by He, Ar, Kr and SF6: A test case of the Hartmann-Tran profile

Spectral shapes of rovibrational lines of CO broadened by He, Ar, Kr and SF6: A test case of the Hartmann-Tran profile

Rotational energy transfer in collisions between CO and Ar at temperatures from 293 to 30 K

Pressure broadening calculations for OH in collisions with argon: Rotational, vibrational, and electronic transitions

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