Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jqsrt..52..531d&link_type=abstract
Journal of Quantitative Spectroscopy & Radiative Transfer (ISSN 0022-4073), vol. 52, no. 5, p. 531-544
Astronomy and Astrophysics
Astronomy
16
Emission Spectra, Flow Velocity, Laser Plasmas, Laser Spectroscopy, Lyman Spectra, Magnetohydrodynamic Flow, Opacity, Plasma Diagnostics, Radiative Transfer, Resonance Lines, Astronomical Spectroscopy, Computerized Simulation, Gradients, Helium, Lyman Alpha Radiation, Space Plasmas, Spectroscopic Analysis
Scientific paper
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-alpha (AlXIII ls-2p) line is an aluminium plasma created with a nanosecond, 0.53 micron laser beam and for the Ly-beta (AlXIII ls-3p) and He-beta (AlXIII ls2-ls3p) lines in a plasma created with a 12 psec, 0.268 micron laser beam. The effect of velocity gradients is found to be of critical importance in determining the line shapes and intensitites.
Djaoui Abdeslem
Rose Steve J.
Wark J. S.
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