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Lookup NU author(s): Professor Alan Dickinson
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Line mixing of the Na 3P-3D lines broadened by atomic hydrogen has been calculated in the impact approximation. The required S-matrix elements are calculated using a time-dependent close-coupling rectilinear-path approximation, the ab initio NaH potentials used by Leininger et al (2000 J. Phys. B: At. Mol. Opt. Phys. 33 1805) being employed. At energies of less than 25 000 cm-1, the real and imaginary parts of the mixing cross sections were found to be about 50 and about 25 times smaller, respectively, than the broadening coefficients, while at about 105 cm-1, the real and imaginary parts were found to be smaller in magnitude by factors of about 200 and 10, respectively. On thermally averaging the cross sections, the line-shape parameters leading to mixing were found to be 50-100 times smaller than the corresponding broadening coefficients for the isolated lines. For a number density of 1016-1017 cm-3 and temperature of 6000 K, the mixed and unmixed line shapes were found to deviate by less than 3% over the range of frequencies for which the application of the impact approximation was valid.
Author(s): Stoker JS-F, Dickinson AS
Publication type: Article
Publication status: Published
Journal: Journal of Physics B: Atomic, Molecular and Optical Physics
Year: 2003
Volume: 36
Issue: 7
Pages: 1309-1318
ISSN (print): 0953-4075
ISSN (electronic): 1361-6455
Publisher: Institute of Physics Publishing
URL: http://dx.doi.org/10.1088/0953-4075/36/7/303
DOI: 10.1088/0953-4075/36/7/303
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