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Abstract <p>The influence of nonequilibrium vibrational-rotational excitation of molecular hydrogen on the final concentration of HF molecules formed by the reaction F + H<sub>2</sub> → HF + H in the photodissociation region at the boundary of the molecular cloud was studied by astrochemical modeling methods. The rate constant for the vibrational level <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({v}\)</EquationSource> <!--PhysChA2670012Pakhanyan-m1--> </InlineEquation> = 1 was obtained using a solution of the quantum scattering problem implemented in the ABC program. In a wide range of conditions within the framework of the model used, the effect of the hydrogen levels occupied under nonequilibrium conditions on the final HF/H<sub>2</sub> ratio (which increases up to 10 times) is comparable in magnitude to the effect introduced by the uncertainty of the equilibrium constants used (the ratio changes ~2.5 times).</p>

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Effect of Nonequilibrium Excitation of Molecular Hydrogen on the HF/H2 Ratio in Diffuse Molecular Clouds

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • I. M. Pakhan’yan,
  • A. V. Stolyarov,
  • D. Z. Vibe

摘要

Abstract

The influence of nonequilibrium vibrational-rotational excitation of molecular hydrogen on the final concentration of HF molecules formed by the reaction F + H2 → HF + H in the photodissociation region at the boundary of the molecular cloud was studied by astrochemical modeling methods. The rate constant for the vibrational level \({v}\) = 1 was obtained using a solution of the quantum scattering problem implemented in the ABC program. In a wide range of conditions within the framework of the model used, the effect of the hydrogen levels occupied under nonequilibrium conditions on the final HF/H2 ratio (which increases up to 10 times) is comparable in magnitude to the effect introduced by the uncertainty of the equilibrium constants used (the ratio changes ~2.5 times).