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Size parameter for thermally emitting particles.

Authors
  • Lynch, D K
  • Mazuk, S
Type
Published Article
Journal
Applied optics
Publication Date
Aug 20, 1999
Volume
38
Issue
24
Pages
5229–5231
Identifiers
PMID: 18324022
Source
Medline
License
Unknown

Abstract

For thermal emission from particles the conventional size parameter X = 2 pi a/lambda does not distinguish between small and large particles. We show that the opacity parameter Omega = 4 pi ka/lambda = 2 kX is a more accurate means of demarcating the two emission regimes. Omega is approximately equal to the particle's mean optical depth, and it can be derived from both scattering theory and geometrical optics.

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