Abstract
We evaluate photoelectron angular anisotropy /3-parameters for the process of sequential two-photon double electron ionization of helium within the time-independent lowest order perturbation theory (LOPT). Our results indicate that for the photoelectron energies outside the interval (Eslow, Efast), where Eslow = ω − IPHe+ and Efast ω − IPHe, there is a considerable deviation from the dipole angular distribution thus indicating the effect of electron correlation.
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