Abstract

Experiments have been performed to determine the variations of the peak area for the CH₄ and N₂ Raman lines along with their frequency shift and broadening, as a function of pressure and density, in the case of an equimolar CH₄/N₂ gas mixture. A comparison is made between the relative values of the Raman scattering cross sections for the two species and the values of the internal field term, versus density of the mixture, showing that the density dependences of these physical quantities become more dissimilar as density increases. Moreover, the ratio of the peak areas for the CH₄ and N₂ Raman lines is found to be constant in the entire pressure range used. From a practical point of view, these results for gas mixtures could be useful in quantitative analysis of fluid inclusions in rocks.

Development of high-resolution N₂ coherent anti-Stokes Raman scattering for measuring pressure, temperature, and density in high-speed gas flows

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Measurements of air-, N₂-, and O₂-broadened halfwidths and pressure-induced line shifts in the ν₃ band of ¹³CH₄

V. Malathy Devi, D. Chris Benner, Mary Ann H. Smith, and Curtis P. Rinsland
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Precise measurements of line broadening and line shifts in low-pressure gases using a heterodyne CO₂ laser spectrometer: applications to C₂H₄ and CH₃OH

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J. Opt. Soc. Am. B 15(4) 1392-1398 (1998)

Raman frequency shifting in a CH₄:H₂:Ar mixture pumped by the fourth harmonic of a Nd:YAG laser

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Transient stimulated Raman scattering in gas mixtures

Vitaly Krylov, Ingo Fischer, Victor Bespalov, Dmitry Staselko, and Aleksander Rebane
Opt. Lett. 24(22) 1623-1625 (1999)