A generalized theory of Stark broadening of hydrogen-like spectral lines in dense plasmas.

Details A generalized theory of Stark broadening of hydrogen-like spectral lines in dense plasmas. A generalized theory of Stark broadening of hydrogen-like spectral lines in dense plasmas.

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jqsrt..54..307o&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 54, issue 1-2, pp. 307-315

Computer Science

10

Stark Broadening: Plasma, Stark Broadening: Helium Lines

Scientific paper

An improved semiclassical theory of Stark broadening of spectral lines emitted by hydrogen-like ions is developed in spirit of the authors' previous papers. Compared to the standard theories, the improvement is achieved by taking into account on equal footing a "dynamic" splitting of Stark sublevels caused by one of the components of the electron microfield and a quasistatic splitting of Stark sublevels caused by ion microfield (only the latter was allowed for in the standard theories). The presented generalized theory is developed analytically to the same level as the standard theories and embraces the latter as one of its limiting cases corresponding to relatively low densities of a plasma. However, for dense plasmas the predictions differ: e.g., for lines with intense central Stark components (such as Lα, Lγ, Hα, etc.) the standard theories noticeably underestimate Stark broadening for high density plasmas. For conditions of the experiment by Grutzmacher and Johannsen previous calculations ended up with halfwidths of the Hα line of He II that were drastically smaller (by factor of two) than the observed halfwidth of this line. Calculations by the authors' generalized theory result in a better agreement with the experiments.

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