EXCITATION AND LOSS PROCESSES OF IONS AT SURFACES

Autor(en): HEILAND, W
NARMANN, A
Stichwörter: CHARGE-EXCHANGE; COLLISIONS; CRYSTAL-SURFACES; ELECTRON-EMISSION; ENERGY-LOSS SPECTROSCOPY; GRAZING-INCIDENCE; Instruments & Instrumentation; METAL-SURFACES; Nuclear Science & Technology; Physics; Physics, Atomic, Molecular & Chemical; Physics, Nuclear; POLARIZED-LIGHT EMISSION; SCATTERING; VIBRATIONAL-EXCITATION
Erscheinungsdatum: 1993
Herausgeber: ELSEVIER SCIENCE BV
Journal: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
Volumen: 78
Ausgabe: 1-4
Startseite: 20
Seitenende: 28
Zusammenfassung: 
Experiments with atomic ionic and neutral particles, scattered at grazing incidence from surfaces, lead to the conclusion that in the solid a large number of electron-hole pairs is excited. These excitations cause energy losses and straggling which are measured in the energy range from 100 eV to 10 keV. The interaction process is understood in terms of the dynamical screening of the moving charge. With molecular particles dissociation is observed. There are three possible pathways for dissociation, i.e. charge exchange, electronic excitation and rovibrational excitation. Evidence for all three processes is found experimentally, however, in most cases rather indirectly by comparison with the results of model calculations. With atomic species capture into excited states of the projectile is observed. Optical spectroscopy of the excited states shows large circular polarization, which depends on the magnetization of the surface. The `'magnetic'' effect will be discussed in relation to the previous topics.
ISSN: 0168583X
DOI: 10.1016/0168-583X(93)95771-V

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