valence shells studied with a reduced geometry model*

Our basic understanding of multiphoton processes in atoms exposed to strong laser field is based on the single active electron picture. Effects like a multiple non-sequential ionization are beyond description in this approach. In such cases, classical or semi-classical descriptions are used typically [1, 2]. Yet, it is possible to construct a model with a reduced geometry that enables a quantomechanical study of triple ionization [3]. In such a case, a special attention must be paid to the electronic configuration of the target atom. We have studied the influence of the symmetry of initial wave function onto ionization yields in a 3-electron systems exposing the difference in hierarchy of processes contributing to triple ionization when comparing atoms with the p³ and ns²np¹ valence shells [3,4]. Additionally, the effect of the third electron onto double ionization in those systems is investigated [5, 6].

[1] K. Sacha, B. Eckhardt, PRA 64, 053401 (2001);

[2] P. J. Ho, J. Eberly, PRL 97, 083001 (2006)

[3] J. H. Thiede et al, PRA 98, 031401 (2018)

[4] J. S. Prauzner-Bechcicki et al., arXiv: 2102.06466

[5] D.K. Efimov, et al., PRA 100, 063408 (2019);

[6] D.K. Efimov et al., PRA 101, 063402 (2020)