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Synopsis Photoionization microscopy (PM) aims at imaging the flux of slow (meV) electrons released by atomic photoionization in the presence of a static electric field. We discuss the rotation of the linear light polari-zation with respect to the electric field direction. Two-photon ionization out of an  m=0  initial state allows for the population of | m |=0,1,2 Stark states. The resulting | m |-beating effects in the PM images are demonstrated theoretically (in hydrogen atom) and experimentally (in Mg atom). Implications on the applicability of tomographic techniques for slow electrons are also discussed.

Photoionization microscopy: linear polarization rotation effects