An interference effect on angular correlation patterns due to the exchange of Auger and photoelectrons of the same energy is discussed. The detection in coincidence of Auger and photoelectrons may reveal a striking angular correlation pattern when a synchrotron light source is tuned so that the Auger and photoelectron energies are nearly equal. This effect is present even when only one electron is detected, but is strongly reduced by the averaging over the direction of the undetected electron.

• Received 15 November 1993

DOI:https://doi.org/10.1103/PhysRevA.50.4031