Survival of He+ ions during grazing scattering from a Ag(111) surface
He+ ions as well as neutral He atoms with keV energies are scattered under a grazing angle of incidence from a clean and atomically flat Ag(111) surface. From a comparison of ion fractions observed after scattering of He+ ions and He atoms we find for energies below some keV small but defined fracti...
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Published in | Physical review letters Vol. 90; no. 3; p. 037602 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
United States
24.01.2003
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Online Access | Get more information |
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Summary: | He+ ions as well as neutral He atoms with keV energies are scattered under a grazing angle of incidence from a clean and atomically flat Ag(111) surface. From a comparison of ion fractions observed after scattering of He+ ions and He atoms we find for energies below some keV small but defined fractions of ions that have survived the complete scattering event with the surface. This feature allows us to clear up the microscopic interaction scenario for Auger neutralization of He+ ions at a Ag(111) surface. The Auger neutralization rates are 2 to 3 orders of magnitude smaller than conventional rates derived from experiments for He+-metal systems and agree with recent calculations. |
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ISSN: | 0031-9007 1079-7114 |
DOI: | 10.1103/PhysRevLett.90.037602 |