Physics
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..dmp.d1081o&link_type=abstract
American Physical Society, 34th Meeting of the Division of Atomic, Molecular and Optical Physics, May 20-24, 2003, Boulder, Colo
Physics
Scientific paper
A computational approach to time-dependent spectral evolution of transient plasmas is developed. X-ray lines arising from the four principal transitions 1s2p, 1s2s (^1P^0_1, ^3P^0_2,1, ^3S_1) arrow 1s^2 (^1S_0) (w, x, y and z respectively) in Helium-like ions, as well as the dielectronic Li-like satellite lines, are modeled for applications to high temperature astrophysical and laboratory plasmas. The time-dependent ionization/recombination and collisional/radiative spectra are computed with a new code, HELINE, in collisional, photo-ionized, and 'hybrid' regimes. The models demonstrate: (i) ionization fractions of iron that differ greatly from equilibrium conditions, (ii) `spectral inversion' of the z and w lines under recombination or ionization dominated conditions, and (iii) variation of the He-like iron Kα complex at 6.6-6.7 keV. This work is applicable to the analysis of transient sources such as X-ray flares in accretion discs around black holes, magnetic Z-pinch devices, and inertial confinement fusion plasmas. Theoretical spectra from HELINE will be compared to results produced by the Los Alamos Suite of Atomic Physics codes.
Fontes Chris
Nahar Sultana
Oelgoetz Justin
Pradhan Anil
Zhang Honglin
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