Anomalous broadening and shifting in D2 and D2–He mixtures

Fakhr-Eslam, S. Hamid; Sheldon, Guy D.; Sinclair, P. M.; Drummond, J. R.; May, A. D.

doi:10.1016/s0022-4073(00)00031-5

Cited by 10 publications

(4 citation statements)

References 36 publications

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“…In this vein, let us mention the experimental studies and line shapes analyses of Smyth et al [9] of Forsman et al [10] and of May and coworkers. [11][12][13][14][15][16] All these studies dealt with the 1-0 Q branch of D 2 in He. We are only aware of one study where measurements were performed for the S 0 (0) to S 0 (4) lines of D 2 in He: Edwards et al [17] reported values for the broadening and shifting coefficients of these lines of D 2 in a helium bath at 293 K using simple Lorentzian line shapes.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the shapes of the He‐perturbed D 2 lines are interesting for testing the D 2 –He interactions, for the determination of the D 2 quadrupole moment, its polarizabilities, the ortho:para concentration ratio at various temperatures and eventually the departures from standard line‐shape profiles. In this vein, let us mention the experimental studies and line shapes analyses of Smyth et al of Forsman et al and of May and coworkers . All these studies dealt with the 1‐0 Q branch of D 2 in He.…”

Section: Introductionmentioning

confidence: 99%

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Testing the ab initio quantum‐scattering calculations for the D₂–He benchmark system with stimulated Raman spectroscopy

Martínez

Bermejo

Thibault

et al. 2018

J Raman Spectroscopy

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This work presents a comparison between experimental and calculated values for the collisional line broadenings and shifts of the S0(0), S0(1), and S0(2) lines of the rotational Raman spectrum of D2 perturbed by He at 77, 195, and 300 K. The pure rotational Raman spectra were obtained by means of a stimulated Raman spectroscopy experimental setup. Close coupling dynamical calculations were performed on the most recent ab initio H2–He potential energy surface. The resulting scattering matrix elements implemented in the general Hess method allow us to provide pressure broadening, pressure shifting, and Dicke coefficients from 10 to 400 K. Experimental and calculated values agree well with each other.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Testing the ab initio quantum‐scattering calculations for the D₂–He benchmark system with stimulated Raman spectroscopy

Martínez

Bermejo

Thibault

et al. 2018

J Raman Spectroscopy

View full text Add to dashboard Cite

show abstract

“…In the case of D 2 , several studies reviewed in [9] have reported line positions of the very weak electric quadrupole transitions using different spectroscopic techniques [10][11][12][13][14][15][16][17][18][19][20][21]. From all these measurements, very few transition frequencies are determined with sufficient accuracy to test the best theoretical predictions.…”

Section: Introductionmentioning

confidence: 99%

Sub-MHz accuracy measurement of the S(2) 2–0 transition frequency of D2 by Comb-Assisted Cavity Ring Down spectroscopy

Mondelain

Kassi

Sala

et al. 2016

Journal of Molecular Spectroscopy

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The line position of the very weak S(2) transition of deuterium in the 2-0 band has been measured with a Comb-Assisted Cavity Ring Down spectrometer.The high sensitivity spectra were recorded at 5 and 10 mbar with a Noise Equivalent Absorption, a min ,of 8Â 10 -11 cm À1 . The line positions at 5 and 10 mbar were measured with sub-MHz accuracy (460 and 260 kHz, respectively). After correction of the line pressure-shift, the frequency at zero pressure of the S(2) transition of the first overtone band was determined to be 187 104 299.51 ± 0.50 MHz. This value agrees within 1.7 MHz with the frequency obtained from the best available ab initio calculations and corresponds to only 15% of the claimed theoretical uncertainty.

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“…The accuracy achieved in the calculations of the hydrogen spectrum gives an exceptional opportunity for a constructive interplay between theory and experiment. This matter of fact motivated recent experimental efforts to determine the absolute frequency of different absorption and Raman transitions for H 2 [5,6,7,8,9,10,11], HD [5,12,13,14,15] and D 2 [5,16,17,18,19,20,21,22,23].…”

Section: Introductionmentioning

confidence: 99%

Transition frequencies in the (2-0) band of D2 with MHz accuracy

Mondelain

Kassi

Campargue

2020

Journal of Quantitative Spectroscopy and Radiative Transfer

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Series of spectra of the S(0) and Q(1)-Q(4) transitions of the (2-0) band of D 2 near 5860 cm -1 are recorded by comb-referenced cavity ring down spectroscopy at four pressures up to 200 Torr. After averaging, high resolution (30 MHz step) and low noise (noise equivalent absorption,  min ≈ 1.5×10 -11 cm -1 ) spectra are obtained for each pressure value. This leads to signal to noise ratios of several hundred for the considered very weak electric quadrupole transitions with intensities ranging between 4×10 -29 and 4×10 -28 cm/molecule. The Q(3) and Q(4) transitions are newly detected.A multi-spectrum treatment of the D 2 line profiles at different pressures performed using a quadratic speed-dependent Nelkin-Ghatak profile leads to residuals close to the noise level. Considering statistical fit errors and possible biases, total uncertainties on the frequencies extrapolated at zero pressure are estimated between 0.30 MHz and 1.83 MHz.The derived experimental frequencies and intensities of (2-0) transitions are gathered with literature values and compared to ab initio values reported in

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Anomalous broadening and shifting in D2 and D2–He mixtures

Cited by 10 publications

References 36 publications

Testing the ab initio quantum‐scattering calculations for the D₂–He benchmark system with stimulated Raman spectroscopy

Testing the ab initio quantum‐scattering calculations for the D₂–He benchmark system with stimulated Raman spectroscopy

Sub-MHz accuracy measurement of the S(2) 2–0 transition frequency of D2 by Comb-Assisted Cavity Ring Down spectroscopy

Transition frequencies in the (2-0) band of D2 with MHz accuracy

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Anomalous broadening and shifting in D2 and D2–He mixtures

Cited by 10 publications

References 36 publications

Testing the ab initio quantum‐scattering calculations for the D2–He benchmark system with stimulated Raman spectroscopy

Testing the ab initio quantum‐scattering calculations for the D2–He benchmark system with stimulated Raman spectroscopy

Sub-MHz accuracy measurement of the S(2) 2–0 transition frequency of D2 by Comb-Assisted Cavity Ring Down spectroscopy

Transition frequencies in the (2-0) band of D2 with MHz accuracy

Contact Info

Product

Resources

About

Testing the ab initio quantum‐scattering calculations for the D₂–He benchmark system with stimulated Raman spectroscopy

Testing the ab initio quantum‐scattering calculations for the D₂–He benchmark system with stimulated Raman spectroscopy