Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quenching of Highly-Rotationally-Excited HCl in Collisions with HE   We report rotational quenching cross sections and rate coefficients of HCl
due to collisions with He. The close-coupling method and the coupled-states
approximation are applied in quantum-mechanical scattering calculations of
state-to-state cross sections for HCl with initial rotational levels up to
$j=20$ for kinetic energies from 10$^{-5}$ to 15000 cm$^{-1}$. State-to-state
rate coefficients for temperature between 0.1 and 3000 K are also presented.
Comparison of the present rate coefficients with previous results reported in
the literature for lowly-excited rotational levels shows reasonable agreement.
Small differences are attributed to the differences in the interaction
potential energy surfaces. The uncertainty in the computed cross sections and
rate coefficients is estimated by varying the potential well depth.
Applications of current results to astrophysical systems are also briefly
discussed.

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The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: cs
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom