K-Shell Photoionization and Photoabsorption of Ne, Mg, Si, S, Ar, and Ca

Details K-Shell Photoionization and Photoabsorption of Ne, Mg, Si, S, Ar, and Ca K-Shell Photoionization and Photoabsorption of Ne, Mg, Si, S, Ar, and Ca

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apjs..182..127w&link_type=abstract

The Astrophysical Journal Supplement, Volume 182, Issue 1, pp. 127-130 (2009).

Astronomy and Astrophysics

Astronomy

8

Atomic Data, Atomic Processes, Methods: Numerical, X-Rays: General

Scientific paper

We present extensive computations of photoabsorption and photoionization cross sections across the K-edge of Ne, Mg, Si, S, Ar, and Ca ions with less than 11 electrons. The calculations are performed using the Breit-Pauli R-matrix method and include the effects of radiative and Auger damping by means of an optical potential. The wave functions are constructed from single-electron orbital bases obtained using a Thomas-Fermi-Dirac statistical model potential. Configuration interaction is considered among all fine-structure levels within the n = 2 complex. The damping processes affect the resonances converging to the K thresholds causing them to display symmetric profiles of constant width that smear the otherwise sharp edge at the photoionization thresholds.

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