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We study the effects of spin degrees of freedom and wave function symmetries on double ionization in three-electron systems. Each electron is assigned one spatial degree of freedom, and the resulting three-dimensional Schrödinger equation is integrated numerically using grid-based Fourier transforms. We reveal 3-electron effects on the yield of double ionization by comparing signals for different ionization channels. We explain our findings by the existence of fundamental differences between 3-electronic and truly 2-electronic spin-resolved ionization schemes and by influence of the 3rd electron Coulomb interactions. We find, for instance, that double ionization from a threeelectron system is dominated by electrons that have the same spin. If they have opposite spins, then the order of the event, first spin up and then spin down, or the reverse, can be determined by correlations with the third electron. arXiv:1905.08357v1 [physics.atom-ph]

Double electron ionisation process occurs when an intense laser pulse interacts with atoms or molecules. Exact ab initio numerical simulation of such a situation is extremely computer resources demanding, thus often one is forced to apply reduced dimensionality models to get insight into the physics of the process. The performance of several algorithms for simulating double electron ionization by strong femtosecond laser pulses are studied. The obtained ionization yields and the momentum distributions of the released electrons are compared, and the effects of the model dimensionality on the ionization dynamics discussed. arXiv:1803.08364v2 [physics.atom-ph]