An investigation of Brueckner's theory of line broadening with application to the sodium D lines

Details An investigation of Brueckner's theory of line broadening with application to the sodium D lines An investigation of Brueckner's theory of line broadening with application to the sodium D lines

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..549a&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Dec. 1, 1991, p. 549-560.

Astronomy and Astrophysics

Astronomy

61

D Lines, Hydrogen Atoms, Sodium, Spectral Line Width, Atomic Collisions, Atomic Interactions, Line Spectra, Solar Atmosphere

Scientific paper

Approximations in Brueckner's theory of spectral line broadening by collisions with neutral hydrogen atoms relevant to a solar-type atmosphere are discussed, and a modified theory for s-p transitions is presented. The theory utilizes explicit expressions for the interatomic interaction energy between a hydrogen atom in its ground state and general m = 0, +/- 1 p states, derived from second-order perturbation theory without exchange, allowing the removal of the Lindholm-Foley average over m states in the original Brueckner model. Approximate upper and lower bounds for the linewidth of the sodium D lines are derived, and these values are contrasted with available theoretical, experimental and solar empirical results. The removal of the Lindholm-Foley average is shown to reduce the D-state linewidths by about 30 percent, and an analysis of the interatomic separations important in the line broadening cross-section for the D lines has shown that there is little atomic overlap at the separations that are important.

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