Relativistic calculations of double $K$-shell photoionization for neutral medium-$Z$ atoms

Abstract

Fully relativistic calculations are presented for the double $K$-shell photoionization cross section for several neutral medium-$Z$ atoms, from magnesium ($Z=10$) up to silver ($Z=47$). The calculations take into account all multipoles of the absorbed photon as well as the retardation of the electron-electron interaction. The approach is based on the partial-wave representation of the Dirac continuum states and uses the Green-function technique to represent the full Dirac spectrum of intermediate states. The method is strictly gauge invariant, which is used as an independent cross check of the computational procedure. The calculated ratios of the double-to-single $K$-shell ionization cross sections are compared with the experimental data and with previous computations.

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• Dual kinetic balance approach to basis set expansions for the Dirac equation
• Two-time Green function method in quantum electrodynamics of high-Z few-electron atoms
• Electron-atom bremsstrahlung: double differential cross section and polarization correlations
• Nuclear size correction to the Lamb shift of one-electron atoms
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Cited by in corpus (1)

• Near--K-edge double and triple detachment of the F- negative ion: observation of direct two-electron ejection by a single photon