Lineshapes of collision-induced absorption (CIA) and of collision-induced scattering (CIS) for monatomic gas mixtures of Ne-Ar

A study is being made of the far infrared absorption occurring in compressed rare-gas mixtures, and compressed homonuclear diatomic gases. The region investigated lies between 20 and 400 cm−1. The spectra are obtained from the Fourier analysis of interferograms produced by a dynamic Michelson interferometer. It is possible to obtain accurate absolute absorption coefficients for broad bands using this method provided care is exercised in the analysis of the interferograms. The necessary precautions are discussed in detail. The precision of the method obtained in practice is demonstrated using the far infrared bands of hydrogen and nitrogen as examples. Only the experimental techniques are discussed in this paper; the detailed results follow in a separate paper.

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Validation of Boltzmann discrete velocity method flow solver for diatomic gases and multi-component monatomic gas mixtures

AIAA Scitech 2020 Forum ◽

10.2514/6.2020-2154 ◽

2020 ◽

Author(s):

Robert E. Harris ◽

Craig P. Turansky

Keyword(s):

Gas Mixtures ◽

Flow Solver ◽

Discrete Velocity ◽

Discrete Velocity Method ◽

Monatomic Gas

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Collision-induced absorption in ethane–rare gas mixtures

Canadian Journal of Physics ◽

10.1139/p83-079 ◽

1983 ◽

Vol 61 (4) ◽

pp. 633-640 ◽

Cited By ~ 2

Author(s):

I. R. Dagg ◽

L. A. A. Read ◽

A. Anderson

Keyword(s):

Fourier Transform ◽

Temperature Dependence ◽

Quadrupole Moment ◽

Gas Mixtures ◽

Rare Gas ◽

Fourier Transform Spectrometer ◽

Rare Gases ◽

Induced Absorption ◽

Absolute Value ◽

The Absolute

The collision-induced spectra of mixtures of ethane and each of the rare gases He, Ar, Kr, and Xe in the 40–360 cm−1 region have been obtained using a Michelson Fourier transform spectrometer. In addition, the temperature dependence of the absorption in ethane and ethane–xenon mixtures is reported. All results have been analyzed according to the theory for quadrupole induced rotation–translation absorption. The absolute value of the quadrupole moment of ethane is estimated to be less than 1.0 B and most likely less than 0.5 B. Various speculations are made concerning the induction mechanisms (other than quadrupolar) for each of the mixtures.

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THEORY OF TRANSLATIONAL ABSORPTION IN GASES

Canadian Journal of Physics ◽

10.1139/p61-014 ◽

1961 ◽

Vol 39 (1) ◽

pp. 189-204 ◽

Cited By ~ 160

Author(s):

J. D. Poll ◽

J. Van Kranendonk

Keyword(s):

Absorption Coefficient ◽

Infrared Absorption ◽

Dipole Moments ◽

Gas Mixtures ◽

Absorption Coefficients ◽

Monatomic Gas

The theory of translational infrared absorption in gases is developed. Invariant expressions for the integrated absorption coefficients are derived. The absorption coefficients are expanded in powers of the density, and the binary absorption coefficients are expressed in terms of a model for the induced pair dipole moments. Monatomic gas mixtures, diatomic gases, and diatomic–monatomic gas mixtures are considered in detail. As an application the binary absorption coefficient of the translational band of hydrogen is calculated.

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