Double photoionization of the Be isoelectronic sequence

Abstract

We investigate the double photoionization (DPI) process along the Be isoelectronic sequence (Be−Ne 6+ ) by solving the time-dependent Schrödinger equation with a spectral method of configuration interaction type. The results that we obtain of the DPI cross sections are in a good agreement with other reported data. We also present the first results of double-to-single photoionization cross sections ratios for Be-like ions in support of possible photofragmentation experiments with x-ray free electron lasers. Finally, we probe the mutual interaction of the valence electrons at different photon energies and examine the subsequent redistribution of the excess photon energy among them.

Investigation of the doubly excited ${}^{1}{P}^{o}$ resonance series of the O6+ ion under the N = 3 threshold of O7+

“…We investigate in the present paper the doubly excited P o 1 states of the O 6+ ion by using a spectral method of configuration interaction type which combines a discretization technique based on B-spline functions [20,21] with the complex rotation method [22,23]. The correlations between the two electrons of the ion are in the present approach incorporated at high degree of accuracy.…”

“…In the calculation of the electronic structure of atomic systems, the optimal value of k can vary between 7 and 10. In the case of two-electron systems, k=7 allows accurate description of the energy spectrum [21,26]. N b is the number of B-splines used per electron in a box of radius r 0 .…”