The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Adsorption of H2O on planar and stepped Si(100): Structural aspects

På svenska

Author

Summary, in English

The adsorption of water on two silicon surfaces [reconstructed planar (100)2×1 and single domain stepped (100)2×1 cut 5° towards (011)] was studied using low-energy electron diffraction and digital imaging electron stimulated desorption ion angular distributions (ESDIAD) as a function of temperature (145–700 K) and coverage. Water has been shown previously to chemisorb dissociatively to form surface OH groups. At 300 K the H + ESDIAD pattern for the planar surface is a nearly symmetric halo, indicating that OH is oriented with its bond vector inclined away from the surface normal, while at low temperatures (200 K) a four-lobed pattern that preserves substrate symmetry is observed. This reversible temperature dependence is related to librations and rotations of the OH complexes. ESDIAD from the stepped surface exhibits a two-lobed pattern, with enhanced emission towards the steps, consistent with bonding of OH to single-domain terrace sites. An interpretation is presented based on the dimer model of the Si(100) reconstruction in which the OH bond axis azimuths are oriented nearly perpendicular to the dimer azimuths.

Publishing year

1987

Language

English

Pages

842-846

Publication/Series

Journal of Vacuum Science & Technology. A. Vacuum, Surfaces, and Films

Volume

5

Issue

4

Document type

Journal article

Publisher

American Institute of Physics (AIP)

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Keywords

  • SURFACE RECONSTRUCTION
  • ADSORPTION
  • DESORPTION
  • CRYSTAL STRUCTURE
  • SILICON
  • WATER
  • HYDROXYL RADICALS
  • SORPTIVE PROPERTIES
  • ELECTRON STIMULATED DESORPTION
  • SURFACE STRUCTURE
  • SURFACE PROPERTIES

Status

Published

Research group

  • Electromagnetic theory

ISBN/ISSN/Other

  • ISSN: 1520-8559