Statistics – Computation
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..774..287k&link_type=abstract
X-RAY DIAGNOSTICS OF ASTROPHYSICAL PLASMAS: Theory, Experiment, and Observation. AIP Conference Proceedings, Volume 774, pp. 28
Statistics
Computation
Neutron Stars, Atomic Structure, Interstellar Magnetic Fields, Hf Calculations, Finite Element Analysis, Neutron Stars, Atomic And Molecular Data, Spectra, And Spectral Parameters, Magnetic And Electric Fields, Polarization Of Starlight
Scientific paper
We have developed a new method for the fast computation of wavelengths and oscillator strengths for medium-Z atoms and ions, up to iron, at neutron star magnetic field strengths. The method is a parallelized multi-configuration Hartree-Fock approach based on finite-element and B-spline techniques. It turns out that typically 15 finite elements are sufficient to calculate energies to within a relative accuracy of 10-5 in 4 or 5 iteration steps using B-splines of 6th order, with parallelization speed-ups of 20 on a 26-processor machine. Results have been obtained for the energies of the ground states and excited levels and for the transition strengths of astrophysically relevant atoms and ions in the range Z = 2 ... 26 in different ionization stages.
Klews Matthias
Werner Klaus
Wunner Günter
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