Low-Energy Ion-Induced Electron Emission from Gas-Covered Surfaces

P. C. Smith, D. N. Ruzic

Research output: Contribution to journalArticle

Abstract

Measurements of ion-induced electron emission have been performed with helium and argon ions with energies between 300 and 900 eV on W, W with 10% Ti, Al, Al with 1% Cu, Al with 1% Si, Si, and Be. This article describes many of the important surface characteristics that influence the ion-induced electron emission. For low-energy ions, the substrate material was found to be less important as the velocity of the incident ion decreased. In the case of incident Ar+ the substrate material had a negligible effect on the emission for this energy range. The presence of an adsorbed layer enhanced emission in all cases. Heating the substrates resulted in oxidation of the surfaces and a subsequent increase in emission. The electron emission from aluminum samples with smaller grain sizes was higher than samples of identical composition with larger grains. This effect is due to the greater number of adsorption sites resulting from the higher grain boundary area.

Original languageEnglish (US)
Pages (from-to)2692-2700
Number of pages9
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume12
Issue number5
DOIs
StatePublished - Sep 1 1994

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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