One-photon two-electron ionization of an atom by circularly polarized light yields triplet differential cross sections different for left and right circular polarization. Necessary kinematical conditions for a finite dichroism are worked out. A numerical calculation for helium which employs correlated wave functions shows the angular correlations of the escaping electron pair to be very different for left and right circular polarization such that the effect should be observable in a coincidence experiment.

• Received 1 June 1992

DOI:https://doi.org/10.1103/PhysRevLett.69.1175