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Generation of unpolarized Auger electrons from linearly polarized radiation

Unpolarized Auger electrons with an isotropic angular distribution are predicted for a primary excitation or ionization of initially unpolarized atoms using completely linearly polarized photons. This phenomenon depends neither on the alignment of the intermediate state nor on the dynamics of the Auger decay and can be observed within a reaction plane that is oriented perpendicular to the direction of the classical electric field vector. A full qualitative and quantitative analysis of this behaviour is given. The effect can be utilized experimentally to generate unpolarized electrons of a fixed energy.