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Title: 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{sup –5} to 15,000 cm{sup –1}. State-to-state rate coefficients for temperatures 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.
Authors:
;  [1]
  1. Department of Physics and Astronomy and the Center for Simulational Physics, The University of Georgia, Athens, GA 30602 (United States)
Publication Date:
OSTI Identifier:
22351598
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 783; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; ASTROPHYSICS; COLLISIONS; COMPARATIVE EVALUATIONS; COUPLING; CROSS SECTIONS; HYDROCHLORIC ACID; INTERACTIONS; QUANTUM MECHANICS; QUENCHING; SCATTERING; SURFACES