Structural studies of adsorbed alkanethiols on Cu(111) by use of S and C K-edge X-ray absorption fine structures

A. Imanishi, K. Isawa, F. Matsui, T. Tsuduki, T. Yokoyama, H. Kondoh, Y. Kitajima, T. Ohta

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Abstract

Surface structures of submonolayer alkanethiol CH3(CH2)n-1SH (n = 6,12) adsorbed on Cu(111) at room temperature (0.3 ML) were investigated by means of S K-edge surface extended X-ray absorption fine structure (EXAFS) and S, C K-edge near-edge X-ray absorption fine structure (NEXAFS) spectroscopies. Polarization dependence of the C K-edge NEXAFS spectra revealed that alkanethiol molecules adsorb with the tilt angle of 12 ± 10° from the surface normal. The S K-edge surface EXAFS determined that the S-Cu distance is 2.31 ± 0.02 Å and that the S atoms locate at a deep three-fold hollow site with significant lateral outward movements of the nearest neighbor Cu atoms.

Original languageEnglish
Pages (from-to)282-292
Number of pages11
JournalSurface Science
Volume407
Issue number1-3
DOIs
Publication statusPublished - 1998 Jun 10

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Keywords

  • Alkanethiol
  • CH(CH)SH
  • CH(CH)SH
  • Cu(111)
  • NEXAFS
  • Surface NEXAFS

ASJC Scopus subject areas

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

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