Abstract
When an atom or ion is scattered from a metal or other surface the scattered particle may be found in a distribution of charge states. He+ scattering is normally assumed to be dominated by Auger neutralisation for which the simple semiclassical theory is discussed. Many charge exchange phenomena actually occur via the direct or resonant electron transfer process of which we give examples. The correct theory of this process is a quantum mechanical or amplitude one. We give a simple account of this theory and emphase the limiting formulae which can be obtained under simple physical assumptions. A detailed application to the neutral fraction of Na scattered from W(110) is given and compared with experiment. Up to now the effect of parallel velocity has not been taken into account. We show how this can be done on a jellium surface by a displacement of the Fermi sphere in momentum space. The results are applied to the H− fraction in H+ scattering from cesiated W(110) which shows a strong parallel velocity effect.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.