Collective Phenomena During Slow Ions / Metastable Atoms Neutralization / De-excitation at Solid Surfaces

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The purpose of this project has been the application of the theoretical techniques of the dynamical response functions calculations to problems of the Electron Energy Loss Spectroscopy (EELS) and slow ions neutralization and metastable atoms de-excitation at solid surfaces.1). The effects of diffraction have been proven to be of major importance in EELS.[V. U. Nazarov and S. Nishigaki, Surf. Sci. 482-485, 640 (2001)]2). The algorithms have been created and the computer codes have been developed to treat the excitation of surfaces by charges with account of the elastic scattering of the latter.3). We have developed an approach in the calculation of inelastic differential cross-sections to the order Z^3, expressed in terms of quadratic retarded density-response functions, deriving by this the formula applicable to describe the electron and positron energy-loss spectroscopy as well as ions scattering.[V. U. Nazarov and S.Nishigaki, Phys. Rev. B65, 094303 (2002)]4). We have proposed a variant of the quadratic response theory which remains valid near and at the plasma resonance and demonstrates that the non-linearity serves itself to restrict the amplitude of plasma oscillations, thus providing a mechanism of nonlinear damping.[V. U. Nazarov, S.Nishigaki, and T.Nagao, Phys. Rev. B 66, 092301 (2002)]