Simulation of atomic transition arrays for opacity calculations

Details Simulation of atomic transition arrays for opacity calculations Simulation of atomic transition arrays for opacity calculations

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrva..44.5707b&link_type=abstract

Physical Review A (ISSN 1050-2947), vol. 44, Nov. 1, 1991, p. 5707-5714.

Statistics

Computation

23

Atomic Spectra, Computerized Simulation, Electron Transitions, High Temperature Plasmas, Opacity, Plasma Equilibrium, Radiative Transfer, Intensities And Shapes Of Atomic Spectral Lines, Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation, Plasma Properties

Scientific paper

A method is proposed for simulating resolved transition arrays of ionized atom spectra in full intermediate coupling. The wave number and intensity of each line in an array are picked at random from separated but correlated distributions. Even though each line is not exactly reproduced, this procedure yields the correct following characteristics of the supposedly symmetric array: total intensity; second and fourth moments of the distributions of unweighted wave numbers, of intensity-weighted wave numbers, and of transition amplitudes; numbers of lines and sums of intensities in consecutive narrow energy ranges. All the parameters of the distribution are obtained by means of compact formulas, or tabulated. Applications to the arrays 4d4 - 4d3 5p of Pd(6+) and 4d7 5s - 4d7 5p of Cd(4+) are presented. Comparison with the explicit results of the Slater-Condon method shows good agreement. It is proposed to use this method for fast and reliable computation of Rosseland means and other opacity properties.

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