Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-04-07
Astron.Astrophys. 404 (2003) 763-774
Astronomy and Astrophysics
Astrophysics
12 pages, 4 tables, 7 figures. Accepted 4 April 2003 in A&A
Scientific paper
10.1051/0004-6361:20030568
The present paper extends the method of Anstee, Barklem and O'Mara (Anstee 1992; Anstee & O'Mara 1991, 1995; Anstee, O'Mara & Ross 1997; Barklem 1998; Barklem & O'Mara 1997; Barklem, O'Mara & Ross 1998), developed during the 1990's for collisional line broadening by atomic hydrogen, to the depolarization of spectral lines of neutral atoms by collisions with atomic hydrogen. In the present paper, we will limit the calculations to p (l=1) atomic levels. The depolarization cross sections and depolarization rates are computed. In Table 2 cross sections as functions of the relative velocity and effective quantum number are given, allowing for the computation for any p atomic level. Our results are compared to quantum chemistry calculations where possible. The sensitivity of depolarization cross sections to regions of the potential is examined. We conclude that the accuracy obtained with our method (< 20 % for the depolarization rates) is promising for its extension to higher l-values for the interpretation of the ``second solar spectrum''. This will be the object of further papers.
Barklem Paul S.
Derouich M.
O'Mara B. J.
Sahal-Bréchot Sylvie
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