Absorption and emission profiles of unresolved arrays near local thermodynamic equilibrium

The absorption and emission arrays in the unresolved transition array (UTA) and super transition array (STA) models are usually assumed to have the same Gaussian spectral shape. It is shown, starting from a Boltzmann population distribution, that the assumption of profile identity for both absorptio...

Full description

Saved in:
Bibliographic Details
Published inJournal of quantitative spectroscopy & radiative transfer Vol. 81; no. 1; pp. 255 - 263
Main Authors Busquet, M., Klapisch, M., Bar-Shalom, A.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.09.2003
Subjects
Emissivities
Opacities
Super-transition arrays
Unresolved transition arrays
Emissivities
Super-transition arrays
Opacities
Unresolved transition arrays
Online AccessGet full text

Cover

More Information
Summary:The absorption and emission arrays in the unresolved transition array (UTA) and super transition array (STA) models are usually assumed to have the same Gaussian spectral shape. It is shown, starting from a Boltzmann population distribution, that the assumption of profile identity for both absorption and emission is inconsistent with Kirchhoff's law. A correcting formula is established. It is extended to the cases where one or two effective population temperatures are involved. Examples are shown where the effect is noticeable.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0022-4073
1879-1352
DOI:10.1016/S0022-4073(03)00078-5