Photoejection of a $3d$ core electron in a rare-earth metal can result in the filling of an unoccupied $4f$ level, leading to a satellite structure of lower binding energy than the most intense $3d$ lines. We calculate the positions of these satellites for La to Tm. No such structure is predicted for Eu, in accord with our photoemission measurements. Results for the other elements agree well with the observed satellite positions.

• Received 7 December 1979

DOI:https://doi.org/10.1103/PhysRevB.22.531