Electron emission during scattering of noble gas ions by a copper surface

In this thesis results are presented on electron emission from scattering of doubly and triply charged noble gas ions at a Cu(110) surface. From these experiments it has been found, that Auger neutralization and resonant transitions followed by autoionization are the main processes contributing to the electron spectra. A model has been constructed by which these features can be reproduced. It appeared to be necessary to invoke a finite response time of the electronic structure of the metal upon changes of the charge state of the projectile in the various charge exchange processes. Angular distributions for autoionization in front of a metal surface are reported for the first time. From the analysis it is concluded, that the formalism relating the decaying atomic state to the measured electron distribution, which is developed for the case of isolated atoms, can be applied to autoionization states arising in scattering experiments of doubly charged helium and neon ions at the copper surface. (author). 66 refs.; 35 figs.; 10 tabs