Physics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jqsrt..27..249l&link_type=abstract
(Conference on Radiative Properties of Hot Dense Matter, Monterey, CA, Nov. 17-20, 1980.) Journal of Quantitative Spectroscopy a
Physics
Dense Plasmas, Frequency Shift, Line Spectra, Plasma Oscillations, Plasma Spectra, Spectral Line Width, Electron Density (Concentration), Electron Transitions, Line Shape, Magnetohydrodynamic Stability, Perturbation Theory
Scientific paper
A determination is made of whether or not observed line shifts in high density plasma environments are originating from individual level shifts. It is shown that level widths cannot be simply added to obtain the total line width, because plasma perturbations couple the upper and lower states of the transition. Two generalized types of contribution to the shift and width operator are described in terms of the relaxation technique using the Zwanzig projection operators. Shifts induced by perturbers at each level of the plasma are in one direction only, on average, for each level, while the same perturber can produce shifts which are different for each level. The averaged shifts may be to the blue although level shifts may be toward the red. Therefore, level shifts are concluded to not yield data on transition shifts, and the calculation of line shapes is a calculation of a two-particle propagator.
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