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Title: Proton-induced fine-structure transitions in O IV

Abstract

Proton-impact excitation of fine-structure transitions in O/sup 3 +/ /sup 2/P/sup 0/ ions is studied in a quasimolecular representation. The /sup 2/Pi and /sup 2/..sigma../sup +/ states of the OH/sup 4 +/ molecule formed by the approach of H/sup +/ and O/sup 3 +/ /sup 2/P/sup 0/ are represented with self-consistent-field wave functions which include the effects of polarization. Accurate, close-coupled solutions of the nuclear scattering equations are obtained and used to assess the accuracy of some approximate scattering descriptions. The elastic approximation is found to overestimate the cross sections at all energies. The Coulomb-Born approximation is accurate at both high and low energies but greatly overestimates the cross sections at intermediate energies. A simple unitarity correction to the Coulomb-Born approximation reduces the errors substantially. For high partial waves, the Coulomb-Born approximation is satisfactory at all energies and cross sections for fine-structure excitation by proton impact can be calculated accurately and efficiently with the use of a combination of close-coupled and Coulomb-Born results. Cross sections accurate to within 25% can be obtained with very little computational effort by a combination of the elastic and Coulomb-Born approximations.

Authors:
; ;
Publication Date:
Research Org.:
Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602
OSTI Identifier:
6369286
Resource Type:
Journal Article
Journal Name:
Phys. Rev. A; (United States)
Additional Journal Information:
Journal Volume: 26:6
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; HYDROGEN IONS 1 PLUS; ION-ION COLLISIONS; OXYGEN IONS; FINE STRUCTURE; ANIONS; BORN APPROXIMATION; CORRECTIONS; ENERGY-LEVEL TRANSITIONS; EXCITATION; HYDROXIDES; CATIONS; CHARGED PARTICLES; COLLISIONS; HYDROGEN COMPOUNDS; HYDROGEN IONS; ION COLLISIONS; IONS; OXYGEN COMPOUNDS; 640304* - Atomic, Molecular & Chemical Physics- Collision Phenomena

Citation Formats

Heil, T G, Green, S, and Dalgarno, A. Proton-induced fine-structure transitions in O IV. United States: N. p., 1982. Web. doi:10.1103/PhysRevA.26.3293.
Heil, T G, Green, S, & Dalgarno, A. Proton-induced fine-structure transitions in O IV. United States. doi:10.1103/PhysRevA.26.3293.
Heil, T G, Green, S, and Dalgarno, A. Wed . "Proton-induced fine-structure transitions in O IV". United States. doi:10.1103/PhysRevA.26.3293.
@article{osti_6369286,
title = {Proton-induced fine-structure transitions in O IV},
author = {Heil, T G and Green, S and Dalgarno, A},
abstractNote = {Proton-impact excitation of fine-structure transitions in O/sup 3 +/ /sup 2/P/sup 0/ ions is studied in a quasimolecular representation. The /sup 2/Pi and /sup 2/..sigma../sup +/ states of the OH/sup 4 +/ molecule formed by the approach of H/sup +/ and O/sup 3 +/ /sup 2/P/sup 0/ are represented with self-consistent-field wave functions which include the effects of polarization. Accurate, close-coupled solutions of the nuclear scattering equations are obtained and used to assess the accuracy of some approximate scattering descriptions. The elastic approximation is found to overestimate the cross sections at all energies. The Coulomb-Born approximation is accurate at both high and low energies but greatly overestimates the cross sections at intermediate energies. A simple unitarity correction to the Coulomb-Born approximation reduces the errors substantially. For high partial waves, the Coulomb-Born approximation is satisfactory at all energies and cross sections for fine-structure excitation by proton impact can be calculated accurately and efficiently with the use of a combination of close-coupled and Coulomb-Born results. Cross sections accurate to within 25% can be obtained with very little computational effort by a combination of the elastic and Coulomb-Born approximations.},
doi = {10.1103/PhysRevA.26.3293},
journal = {Phys. Rev. A; (United States)},
number = ,
volume = 26:6,
place = {United States},
year = {1982},
month = {12}
}