X-Ray Absorption and the Post-Auger Decay Spectrum of Multielectron Atoms

Details X-Ray Absorption and the Post-Auger Decay Spectrum of Multielectron Atoms X-Ray Absorption and the Post-Auger Decay Spectrum of Multielectron Atoms

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..335s&link_type=abstract

Astrophysical Journal, Vol.245, P. 335, 1981

Astronomy and Astrophysics

Astrophysics

11

Scientific paper

Auger ionization frequently leaves an atom in an excited state which decays to the ground state by a spontaneous radiative cascade. This process has not previously been considered and is potentially important as a source of line emission following X-ray absorption. We show that the post-Auger decay yields a rich spectrum of UV and optical emission lines as a direct signature of the X-ray absorption.
Our results are applied to some astrophysical problems of interest. We show that the direct X-ray-induced emission considered here may contribute to the UV line spectra of quasars and Seyfert galaxies, as well as those of Galactic compact X-ray sources. We also find that the neutral gas responsible for the absorption turnover in the soft X-ray spectrum of the Crab Nebula may be a detectable source of neutral oxygen fluorescent Kα emission at 0.525 keV if the gas is local to the nebula. The same gas should be undetectable in its O III post-Auger decay lines.

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