The Collision-Induced Absorption Spectra of Hydrogen Complexes in the Second Overtone Band

Abstract

The second overtone band (3-0) of pure hydrogen spectra at different temperatures and hydrogen gas densities is reviewed with particular emphasis on the most recent theoretical and experimental results. Different experimental and theoretical techniques were used to record and calculate the second overtone band profiles. The calculated theoretical binary and ternary absorption coefficients are in good agreement with experimental values obtained. Different line shapes were used to fit the experimental profiles. The fitting values are tabulated in the references therein. The goal of this article is to draw the attention of the absorption spectroscopy community to the fact that there have been only a few investigations on the latter subject on the second overtone band (3-0) on
hydrogen, even though the investigations on the other bands are quite abundant.

Keywords: Collision-induced spectroscopy, Infrared absorption, CIA, IR spectra, H2, Second overtone band, Line shape functions, Roto-vibrational state.

PACS: 33.15.Mt, 33.20.a, E33.20.Vq