Unification of the impact and One-Perturber theories of line shapes

Peach, G., Mullamphy, D.F.T., and Whittingham, I.B. (2008) Unification of the impact and One-Perturber theories of line shapes. In: Proceedings of 19th International Conference on Spectral Line Shapes (1058), pp. 234-236. From: 19th International Conference on Spectral Line Shapes, 15-20 June 2008, Valladolid, Spain.

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Abstract

It is shown that one-perturber theory can be rewritten into a form from which the quantity that directly corresponds to the width of the line as calculated from the impact approximation can be extracted. The theory uses a full quantum mechanical description of the emitter-perturber system and line widths for the lithium resonance lines broadened by helium have been calculated using both impact and one-perturber theory for the temperature range 0.1 < T < 3000 K. Agreement is excellent for T > 20 K.

Item ID: 9263
Item Type: Conference Item (Presentation)
Keywords: spectral line broadening; calculations - Brown dwarfs; alkali resonance doublets - Brown dwarfs; synthetic spectra
ISBN: 978-0-7354-0588-2
ISSN: 1931-3012
Date Deposited: 27 Aug 2010 05:49
FoR Codes: 02 PHYSICAL SCIENCES > 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics > 020201 Atomic and Molecular Physics @ 80%
02 PHYSICAL SCIENCES > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems @ 20%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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