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Water vapor line wing absorption and violation of the long-wave approximation for molecular centers of mass

  • Spectroscopy of Ambient Medium
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Abstract

Further development of the asymptotic line wing theory is presented where the long-wave approximation for the molecular centers of mass is violated. This provides long molecular trajectories going far beyond an elementary volume in the case of nonresonance light absorption. The occurrence of long trajectories is evidence for a certain degree of ordering of molecular chaos. The latter can be described by means of a modified semiclassical representation method to establish correlation between the displacement and velocity operators. An expression for the absorption coefficient is derived that allows an ambiguity concerning the estimation of the parameters of the potentials to be avoided, and the temperature dependence of the absorption coefficient in line wings to be described. In our earlier work, calculations of the absorption coefficient were performed with violation of the long-wave approximation for molecular centers of mass for H2O molecule in the 8–12 μm region using a diffusion model. This model is also employed in the present work for H2O absorption in the 3–5 μm window regions and for CO2 absorption in the 4.3-μm band wing to describe the temperature dependence of the absorption coefficient. Long molecular trajectories essential for the 8–12 and 3–5 μm H2O regions are shown to hardly play a role in the 4.3-μm CO2 band wing.

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Authors and Affiliations

  1. Tomsk State Pedagogical University, Tomsk, 634061, Russia

    Ju. V. Bogdanova

  2. V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk, 634055, Russia

    T. E. Klimeshina & O. B. Rodimova

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  1. Ju. V. Bogdanova
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  2. T. E. Klimeshina
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  3. O. B. Rodimova
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Correspondence to Ju. V. Bogdanova.

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Original Russian Text © Ju.V. Bogdanova, T.E. Klimeshina, O.B. Rodimova, 2016, published in Optika Atmosfery i Okeana.

The article was translated by the authors.

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Bogdanova, J.V., Klimeshina, T.E. & Rodimova, O.B. Water vapor line wing absorption and violation of the long-wave approximation for molecular centers of mass. Atmos Ocean Opt 30, 111–122 (2017). https://doi.org/10.1134/S1024856017020063

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  • DOI: https://doi.org/10.1134/S1024856017020063

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