ADSORBATE INDUCED NEUTRALIZATION EFFECTS IN LOW ENERGY ALKALI AND INERT GAS ION SCATTERING.

S. H. Overbury, B. M. Dekoven, Peter C Stair

Research output: Contribution to journalArticle

Abstract

The dissociative adsorption of oxygen on Mo(001) was studied using low energy (500-1000 ev) Li** plus , K** plus and He** plus ion scattering. Oxygen adsorption affects the energy and angular distributions of scattered ions, and also the intensity of scattered ions changes in a manner which is dependent upon the type of ion used. The scattered ion intensities were examined as a function of oxygen exposure and compared for each type of ion for the same surface structure and under identical scattering geometry. The He** plus intensity drops very sharply with increasing oxygen exposure. The Li** plus intensity in all azimuths exhibits an initial decrease followed by a large increase and ultimately a decrease again as oxygen exposure increases. The K** plus intensity, while decreasing with exposure for incidence in the left bracket 100 right bracket azimuth, is relatively unaffected by low oxygen exposure in the left bracket 110 right bracket azimuth. These contrasting dependencies are discussed and explained as manifestations of different neutralization mechanisms occuring in each case.

Original languageEnglish
JournalNuclear Inst. and Methods in Physics Research, B
Volume230
Publication statusPublished - Mar 1983

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Instrumentation
  • Surfaces and Interfaces

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