Abstract
A method that allows the simulation of K-shell resonance line emission in low density as well as high density laser-produced plasmas is described. The effect of resonance line trapping on ionic populations is taken into account using escape probabilities. A multi-frequency line transfer algorithm that allows for plasma flow velocity gradients, and includes a choice of Doppler, Voigt, or a convolution of Doppler and Stark profiles, is described. The application of the code is illustrated by a set of calculations for the Ly-α (AlXIII 1 s−2 p) line in an aluminium plasma created with a nanosecond, 0.53 μm laser beam and for the Ly-β (AlXIII 1 s−3 p) and He-β (AlXII 1 s 2−1 s3 p) lines in a plasma created with a 12 psec, 0.268 μm laser beam. The effect of velocity gradients is found to be of critical importance in determining the line shapes and intensities.
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