Autoionization in Astrophysics

Physics – Atomic Physics

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Scientific paper

The interpretation of cosmic spectra relies on a vast sea of atomic data which are not readily obtainable from analytic expressions or simple calculations. Rather, their evaluation typically requires state-of-the-art atomic physics calculations, with the inclusion of weaker effects (spin-orbit and configuration interactions, relaxation, Auger broadening, etc.), to achieve the level of accuracy needed for use by astrophysicists. This talk will focus on the important role of accurately describing atomic autoionizing states (resonances), and their subsequent decay behaviors, in astrophysical processes. Recent improved theoretical atomic physics calculations that resolve earlier inaccuracies will be presented, and the resulting astrophysics consequences will be discussed. In particular, the branching between fluorescence and Auger decay of inner-shell vacancy states, which affects ionization equilibrium predictions, and their strong presence in absorption spectra, which is used for elemental abundance studies of the inter-stellar medium, will be addressed. Additionally, new dielectronic recombination (DR) studies of outer-shell autoionizing states will be presented, with emphasis on the good agreement between present theoretical and experimental results (in contrast to earlier calculations) and the important astrophysical implications.

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