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Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 19: Atomic systems in external fields II

A 19.3: Vortrag

Dienstag, 13. März 2012, 14:30–14:45, V57.05

Hartree-Fock calculations for the photoionisation of light to medium-heavy atoms and ions in neutron star magnetic fields — •Peter Diemand, Thorsten Kersting, Damir Zajec, and Günter Wunner — 1. Institut für Theoretische Physik, Universität Stuttgart

We derive the photoionisation cross section in dipole approximation for many-electron atoms and ions in neutron star magnetic field strengths in the range of 107 to 109 T. Both bound and continuum states are treated in adiabatic approximation in a self-consistent way. Bound states are calculated by solving the Hartree-Fock-Roothaan equations using finite element and B-spline techniques. We have taken into account mass and photon density in the neutron star’s atmosphere as well as thermal occupation. The data are of importance for the quantitative interpretation of observed x-ray spectra that originate from the thermal emission of isolated neutron stars. They can serve as input for modeling neutron star atmospheres as regards chemical composition, magnetic field strength, temperature, and redshift. Our main focus in this talk lies on helium, since it is simple enough to calculate all possible transitions when limiting the quantum numbers, while still being sufficiently complicated to show all the basic structures and behaviour of heavier elements up to iron.

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