Electron-Core-Hole Interaction in GaAsP

Abstract
The electron-core-hole interaction is studied via energy derivative reflectance spectra of 20-eV transitions from Ga 3d core levels to lower conduction-band final states in GaAs1xPx alloys. A two-level anticrossing behavior of line shapes and threshold energies as the relative positions of the L and X minima invert yields a previously unanticipated LX mixing energy |VLX|50 meV.