Faculté des sciences

K-shell double photoionization of Be, Mg, and Ca

Kheifets, A. S. ; Bray, Igor ; Hoszowska, Joanna

In: Physical Review A, 2009, vol. 79, no. 4, p. 042504

We perform convergent close-coupling calculations of double photoionization (DPI) of the K-shell of alkaline-earth metal atoms (Be, Mg, and Ca) from the threshold to the nonrelativistic limit of infinite photon energy. Theoretical double-to-single photoionization cross-section ratios for Mg and Ca are compared with experimental values derived from high-resolution x-ray spectra following the... Plus

Ajouter à la liste personnelle
    Summary
    We perform convergent close-coupling calculations of double photoionization (DPI) of the K-shell of alkaline-earth metal atoms (Be, Mg, and Ca) from the threshold to the nonrelativistic limit of infinite photon energy. Theoretical double-to-single photoionization cross-section ratios for Mg and Ca are compared with experimental values derived from high-resolution x-ray spectra following the radiative decay of the K-shell double vacancy. We investigate the role of many-electron correlations in the ground and doubly-ionized final states played in the DPI process. Universal scaling of DPI cross section with an effective nuclear charge is examined in neutral atoms in comparison with corresponding heliumlike ions.