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

这个项目的目的是将动态响应函数计算的理论技术应用于电子能量损失谱(EELS)和慢离子中和以及亚稳原子在固体表面的去激发问题。绕射效应在鳗鱼中已被证明是非常重要的。SCI。482-485,640(2001)]2)。建立了相应的算法，并编制了相应的计算机程序，以处理考虑弹性散射的电荷对表面的激发。我们发展了一种用二次延迟密度响应函数表示的Z^3阶非弹性微分截面的计算方法，由此导出了适用于描述电子和正电子能量损失谱以及离子散射的公式。修订本B65,094303(2002年)]4)。我们提出了二次响应理论的一种变体，它在等离子体共振附近和在等离子体共振时仍然有效，并证明了非线性本身限制了等离子体振荡的幅度，从而提供了一种非线性衰减机制。版本B 66,092301(2002年)]

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)]