Abstract
The angular distribution of photoelectrons and linear magnetic dichroism in the angular distribution for the $4p$ photoemission from Rb atoms in the ground state, oriented by laser pumping, were measured in the photon energy range from $50$ to $100$ eV. The experimental results are compared with the multiconfiguration Dirac-Fock (MCDF) calculations. We show that the zero-crossing of the dichroism as a function of energy is connected with the Cooper minimum in the cross section. This fact can be used for an accurate determination of the position of the Cooper minimum.
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