Comments on alternative calculations of the broadening of spectral lines of neutral sodium by H-atom collisions

Barklem, PS and OMara, BJ (2001) Comments on alternative calculations of the broadening of spectral lines of neutral sodium by H-atom collisions. Journal of Physics B-atomic Molecular And Optical Physics, 34 23: 4785-4799. doi:10.1088/0953-4075/34/23/321


Author Barklem, PS
OMara, BJ
Title Comments on alternative calculations of the broadening of spectral lines of neutral sodium by H-atom collisions
Journal name Journal of Physics B-atomic Molecular And Optical Physics   Check publisher's open access policy
ISSN 0953-4075
Publication date 2001
Sub-type Article (original research)
DOI 10.1088/0953-4075/34/23/321
Volume 34
Issue 23
Start page 4785
End page 4799
Total pages 15
Editor K. Burnett
Place of publication United Kingdom
Publisher Institute of Physics Publishing
Collection year 2001
Language eng
Subject C1
240101 Astronomy and Astrophysics
780102 Physical sciences
Abstract With the exception of the sodium D-lines, recent calculations of line broadening cross sections for several multiplets of sodium by Leininger et al (Leininger T, Gadea F X and Dickinson A 2000 J. Phys. B: At. Mol. Opt. Phys. 33 1805) are in substantial disagreement with cross sections interpolated from the tables of Anstee and O'Mara (Anstee and O'Mara 1995 Mon. Not. R. Astron. Soc. 276 859) and Barklem and O'Mara (Barklem P S and O'Mara B J 1997 Mon. Not. R. Astron. Soc. 290 102). The discrepancy is as large as a factor of 3 for the 3p-4d multiplet. The two theories are tested by using the results of each to synthesize lines in the solar spectrum. It is found that generally the data from the theory of Anstee, Barklem and O'Mara produce the best match to the observed solar spectrum. It is found, using a simple model for reflection of the optical electron by the potential barrier between the two atoms, that the reflection coefficient is too large for avoided crossings with the upper states of subordinate lines to contribute to line broadening, supporting the neglect of avoided ionic crossings by Anstee, Barklem and O'Mara for these lines. The large discrepancies between the two sets of calculations is a result of an approximate treatment of avoided ionic crossings for these lines by Leininger et al (Leininger T, Gadea F X and Dickinson A 2000 J. Phys. B: At. Mol. Opt. Phys. 33 1805).
Keyword Optics
Physics, Atomic, Molecular & Chemical
Hydrogen-atoms
Solar Abundance
Cross-sections
Transitions
Width
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
 
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Created: Tue, 14 Aug 2007, 16:14:14 EST