We present the first measurements of the rototranslational absorption spectrum of the CH4cm –Ar gaseous system in the far infrared region 40–600−1K at densities as low as possible; the binary absorption spectrum of the CH . Measurements were made at 296, 243, and 1954–Ar pair was then obtained. We performed a line-shape analysis of these spectra following the procedure previously introduced for pure methane. We find that the experimental data can be described at high frequencies by using ab initio values of the octopole and hexadecapole multipole moments and anisotropic overlap intensities very close to those used for pure methane. At low frequencies, the computed spectrum is significantly lower than the experimental data at any temperature. We thus include in our analysis a low-frequency spectral contribution associated with the isotropic overlap induction mechanism. Good fits of the experimental data are then obtain at each temperature over all the spectral range.

Dore, P., Filabozzi, A. (1990). Far infrared absorption of the gaseous CH4–Ar mixture. CANADIAN JOURNAL OF PHYSICS, 68(10), 1196-1199 [10.1139/p90-169].

Far infrared absorption of the gaseous CH4–Ar mixture

FILABOZZI, ALESSANDRA
1990-01-01

Abstract

We present the first measurements of the rototranslational absorption spectrum of the CH4cm –Ar gaseous system in the far infrared region 40–600−1K at densities as low as possible; the binary absorption spectrum of the CH . Measurements were made at 296, 243, and 1954–Ar pair was then obtained. We performed a line-shape analysis of these spectra following the procedure previously introduced for pure methane. We find that the experimental data can be described at high frequencies by using ab initio values of the octopole and hexadecapole multipole moments and anisotropic overlap intensities very close to those used for pure methane. At low frequencies, the computed spectrum is significantly lower than the experimental data at any temperature. We thus include in our analysis a low-frequency spectral contribution associated with the isotropic overlap induction mechanism. Good fits of the experimental data are then obtain at each temperature over all the spectral range.
1990
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/01 - FISICA SPERIMENTALE
English
Con Impact Factor ISI
Dore, P., Filabozzi, A. (1990). Far infrared absorption of the gaseous CH4–Ar mixture. CANADIAN JOURNAL OF PHYSICS, 68(10), 1196-1199 [10.1139/p90-169].
Dore, P; Filabozzi, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/52473
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