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Atomic and Laser Spectroscopy$
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Alan Corney

Print publication date: 2006

Print ISBN-13: 9780199211456

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780199211456.001.0001

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Radiative transfer and the formation of spectral lines

Radiative transfer and the formation of spectral lines

(p.289) 10 Radiative transfer and the formation of spectral lines
Atomic and Laser Spectroscopy

Alan Corney

Oxford University Press

This chapter derives the equation of radiative transfer for an excited gas sample. The terms source function and optical thickness are also defined, and the effects of self absorption are considered. The formation of absorption lines is explained and measurements of the product of atomic density, oscillator strength, and sample length are discussed. Applications to the measurement of the abundance of chemical elements in stellar and terrestrial sources are outlined.

Keywords:   radiative transfer, emission and absorption lines, source function, optical thickness, self-absorption, atomic densities, oscillator strengths

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