CHARGE-STATE OF ATOMIC PARTICLES EJECTED FROM SOLID-SURFACES - INFLUENCE OF INITIAL CONDITIONS

The charge exchange between the solid and the atomic particle during i ts ejection from the surface was considered in the framework of the ti me-dependent Anderson-Newns model. Use of equilibrium initial conditio ns (in the sense of the summary system of a ''hybridized atom-surface' ') is justified. An analytical solution for the final charge state of the atomic particle was derived. Two channels of charge exchange were shown to be present: the ''dynamical'' one (due to the finiteness of t he characteristic time of hybridization switching off) and that relate d to the system ''memory'' (influence of the initial state). Situation s in which one of the mentioned channels predominated were considered, as well as the case of the quantum interference of these channels lea ding to the oscillating dependence of the final charge state of the es caping atomic particle on its energy.