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 GaAs_1-xPₓ 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 L-X mixing energy |VLX|~50 meV.
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Kelso et al. (1980) studied this question.
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