STRUCTURE OF ATOMIC OXYGEN AND CARBON OVERLAYERS ON THE Mo(001) SURFACE STUDIED BY LOW ENERGY ION SCATTERING.

S. H. Overbury, Peter C Stair

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

The bonding geometry of atomic overlayers composed of submonolayer quantities of pure oxygen, pure carbon, and a mixture of carbon and oxygen on a Mo(100) surface has been studied for the first time by low energy angle-resolved K** plus and Li** plus ion backscattering. The surface composition and long range ordering of the clean and adsorbate-covered surfaces were also characterized by Auger and LEED. The overlayers were generated in UHV by dissociative adsorption of O//2 or CO or by thermal cracking of C//2H//4 on the clean Mo(100) surface. The absence of double scattering along the left bracket 110 right bracket direction for the oxygen overlayer compared to the clean surface indicates that the oxygen atoms are located in fourfold hollows on the surface. This is confirmed by Monte Carlo simulations of the K** plus scattering. Li** plus scattering results corroborate this structural model. The K** plus scattering energy distributions from pure carbon and mixed carbon/oxygen overlayers are very similar to the oxygen overlayer suggesting that carbon is also situated in the fourfold hollow.

Original languageEnglish
Pages (from-to)1055-1058
Number of pages4
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume1
Issue number2 pt 2
DOIs
Publication statusPublished - Apr 1982

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Physics and Astronomy (miscellaneous)
  • Surfaces and Interfaces

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