Redistribution of resonance radiation in hot and dense plasmas

A method for calculating the redistribution of resonance radiation in hot, dense plasmas is developed by extending the frequency fluctuation model (FF M). This model was originally designed as a numerical procedure for the cal culation of the spectral shape of Stark-broadened lines emitted by multiele ctron ions and has been particularly useful in computations accounting for the ion dynamics effect. The FFM is based on a numerical technique that rep laces the primitive inhomogeneous Stark component contributions to the line ar response line shape with the observable radiative channels. These channe ls can be viewed as equivalent to a system of microfield dressed two-level radiators, the Stark-dressed transitions (SDT), which emit a set of spectra l lines that reproduce the main features of the first-order radiative prope rties of the emitter. The mixing of these transitions through a stochastic process is equivalent to random fluctuations of the local ion microfield. T he SDT form the basis for the extension of the FFM to the computation of no nlinear response functions. The theory of the second-order radiative redist ribution function is reviewed and examples are given. [S1050-2447(99)08008- 7].