Evaluation and universal curves of the photon loss probability

Details Evaluation and universal curves of the photon loss probability Evaluation and universal curves of the photon loss probability

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jqsrt..26..377k&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 26, Oct. 1981, p. 377-380.

Physics

Plasma Physics

5

Collision Rates, Light Scattering, Photons, Plasma Physics, Plasma-Electromagnetic Interaction, Radiative Transfer, Atomic Excitations, Electron Density (Concentration), Electron Gas, Plasma Temperature, Solar Atmosphere, Transition Probabilities

Scientific paper

In the transfer of radiation in a plasma, an important parameter (which measures the coupling between the radiation field and the electron gas) is the photon loss probability per scattering epsilon, defined as the ratio of collisional de-excitation to total de-excitation. The evaluation of epsilon requires normally knowledge of specific collisional excitation rates and radiative transition rate coefficients. In the considered investigation a general formula for epsilon is obtained which depends only on electron density, temperature, and line wavelength. Use is made of a simple Bethe-Coulomb expression recently derived by Kastner (1980) for the collisional excitation rate coefficient. Epsilon is obtained as a function of the three variables, and universal curves of it can be constructed with one of the variables as parameter. As an example of the application of the considered procedure, the variation of epsilon with height h in the solar atmosphere is shown in a graph for several solar lines.

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