L-shell X-ray opacity of many-electron atoms

Details L-shell X-ray opacity of many-electron atoms L-shell X-ray opacity of many-electron atoms

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..403j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 1, May 20, 1992, p. 403-408.

Statistics

Computation

11

Atomic Structure, Opacity, X Ray Sources, Computational Astrophysics, Cosmic Plasma, Fine Structure, Hartree Approximation, Iron

Scientific paper

The study presents a formulation for obtaining the L-shell photoelectric cross section (sigmaL) for many-electron atomic systems. A scaling law is suggested for the evaluation of the contribution to sigmaL from 2s and 2p ejection from a general system in any ionization state. The formula is expressed in terms of the effective nuclear charge (Z2s and Z2p) seen by the corresponding bound electrons, with Z2s and Z2p, obtained from improved screening constants derived in a recent investigation. A comparison is made of Hartree-Fock and hydrogenic expressions for sigmaL with experimental results for atomic neon at X-ray photon energies, providing the basis for the scaling law and an approximate energy dependence for the cross sections. The special case of sigmaL for atomic Fe is considered in detail. This L edge has structure because of the different threshold for 2s and 2p photoejection; the latter has fine structure.

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