The influence of many-particle effects beyond the Debye approximation on spectral line shapes in dense plasmas.

Details The influence of many-particle effects beyond the Debye approximation on spectral line shapes in dense plasmas. The influence of many-particle effects beyond the Debye approximation on spectral line shapes in dense plasmas.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jqsrt..56..423h&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 56, issue 3, pp. 423-441

Computer Science

5

Plasma: Line Profiles, Plasma: Radiative Transfer

Scientific paper

The influence of dense plasmas on profiles of isolated spectral lines has been investigated on the basis of a recently developed consequent many-particle approach. As the most important result of this approach the electron-atom interaction became dynamically screened. It has been proved here that this screening takes place if the energy distance between the involved levels compares with the plasma frequency. The parameter which is mainly affected by this screening turns out to be the shift of the line while the broadening is less influenced. The neglection of the dynamic character of the screening by means of a static approximation, as, for example, a Debye approximation, is shown to be of important consequences and often can only be considered as a crude estimation. The reason consists in the replacement of the different screening functions each depending on the concrete contributing level by a general function being equal for all levels. For the aim of illustration, calculations have been performed for the Xe I 467.1 nm and Cs I 621.3 nm lines which react quite sensitively on these effects. A comparison with corresponding experiments reveals that only by taking into account the dynamic character of screening for both lines the experimental behaviour can be explained.

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