SURFACE ELECTRONIC FLUCTUATIONS IN METALS AND RAMAN LIGHT-SCATTERING

The effect of a surface on electronic fluctuations in anisotropic meta ls is studied theoretically. The Coulomb interaction of the electron-h ole excitations is taken into account self-consistently. A system cons isting of the Boltzmann equation for electronic fluctuations and the M axwell equations for the interaction field is solved with appropriate boundary conditions. The cross section of inelastic light scattering i s calculated. The scattered light observed out of the metal is a resul t of the collective electron interaction with radiation inside the met al. The scattering cross section consists of the bulk contribution of electron-hole pairs and plasmons, which differs from the scattering by an infinite metal only in the effect of the penetration of radiation in the skin layer. The surface contribution to the cross section is at tributed to the electromagnetic excitations of the nonradiative into-v acuum surface plasmons (the sharp peak) and the radiative surface plas mons (the continuum with a peak).