Abstract
The contribution of inelastic electron-electron scattering to the decay rate of excitations in the surface states and first two image potential states at the Ȳ point on the surface is calculated in the GW approximation, and the quasi-momentum dependence of the corresponding contribution for the surface states is analyzed. The mechanisms of electron scattering in these states are studied, and the temperature dependence of the excitation lifetime is analyzed with allowance for the contribution of the electron-phonon interaction calculated earlier.
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