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. Proceedings of 19th International Conference on Spectral Line Shapes. 19th International Conference on Spectral Line Shapes , 15-20 June 2008, Valladolid, Spain , pp. 234-236.
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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 Type:||Conference Item (Presentation)|
|Keywords:||spectral line broadening; calculations - Brown dwarfs; alkali resonance doublets - Brown dwarfs; synthetic spectra|
|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%|
|Deposited On:||27 Aug 2010 15:49|
|Last Modified:||12 Feb 2011 03:25|
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