Effect of Electronic Correlations in the X-Ray Edge, and Recoil Problems

Abstract

It is shown that a self-consistent Hartree-Fock treatment of the x-ray edge profile in metals modifies the singularity near threshold predicted by current theories. Some exact results are presented for the response spectrum of a charged Fermi liquid recoiling under a sudden applied potential. These do indicate a strongly asymmetrical spectrum of recoil energies for weak perturbations, similar to that predicted for noninteracting particles.