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) |
| ISBN: | 978-0-7354-0588-2 |
| ISSN: | 1931-3012 |
| Keywords: | spectral line broadening; calculations - Brown dwarfs; alkali resonance doublets - Brown dwarfs; synthetic spectra |
| 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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