The escape factor in plasma spectroscopy. I  The escape factor defined and evaluated. II  The case of radiative decay. III  Two case studies
Abstract
In plasma spectroscopy, it is frequently convenient to treat the effect of selfabsorption parametrically as a reduction in the spontaneous transition probability by a parameter known in the literature relating to lab studies as the escape factor. In the present paper the concept of the escape factor is developed in a systematic way; a definition is given and the escape factor is evaluated for Gaussian, Lorentzian, and Holtsmarkian profiles, for upper and lower limits to the source function, and for infinite planeparallel slab and infinite cylinder geometries. In addition, a case study of the escape factor for a source decaying radiatively is presented. This is followed by a discussion of two contrasting approaches to the evaluation of the escape factor.
 Publication:

Journal of Quantitative Spectroscopy and Radiative Transfer
 Pub Date:
 July 1979
 DOI:
 10.1016/00224073(79)90102X
 Bibcode:
 1979JQSRT..22....1I
 Keywords:

 Plasma Decay;
 Plasma Spectra;
 Probability Theory;
 Self Absorption;
 Asymptotic Methods;
 Line Spectra;
 Opacity;
 Photons;
 Plasma Cylinders;
 Plasma Slabs;
 Transition Probabilities;
 Plasma Physics