Migration and abstraction of H-atoms from the Cu(1 1 1) surface

M. F. Luo, D. A. MacLaren, W. Allison

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Isothermal measurements of the helium specular reflectivity from H-Cu(1 1 1) are used to demonstrate that adsorbed hydrogen is removed from the surface in an activated process according to first-order kinetics. The measurements were taken at low coverages with surface temperatures in the range of 210-245 K, where we derive an activation-energy of 64.3 ± 1.3 kJ mol-1. The observation allows us to rule out second-order, molecular desorption processes and supports the conclusion that the H atoms are transported from surface to sub-surface sites by an activated process. The results confirm an earlier suggestion that, in the low coverage limit, the sub-surface state for this system is more energetically favourable than other states. In addition, the measurements suggest abstraction processes take place with a probability of (4.3 ± 1.0)s0, where s0 is the initial sticking probability.

Original languageEnglish
Pages (from-to)109-114
Number of pages6
JournalSurface Science
Volume586
Issue number1-3
DOIs
StatePublished - 20 Jul 2005

Keywords

  • Adsorption kinetics
  • Atom-solid scattering and diffraction
  • Copper
  • Hydrogen atom
  • Molecule-solid reactions
  • Surface structure

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