Subsurface hydrogen at Pd(100) induced by gas-phase atomic hydrogen

H. Okuyama, T. Nakagawa, W. Siga, N. Takagi, M. Nishijima, T. Aruga

研究成果: Contribution to journalArticle査読

20 被引用数 (Scopus)

抄録

We have studied the interaction of gas-phase atomic H(g) (D(g)) with H(a) (D(a)) atoms preadsorbed on the Pd(100) surface. The preadsorbed atoms are forced by the impinging atoms to be absorbed into the Pd substrate. The absorbed hydrogen, H(b), was found to occupy the subsurface site just beneath the surface and its saturation coverage was determined to be 1.06 ± 0.16 monolayer (ML). The cross sections for the absorption were found to be different between the cases with and without subsurface H atoms just beneath the surface species, and are estimated to be 2.1 ± 0.6 and 5.3 ± 1.5 Å2, respectively. Upon annealing the sample, H atoms in the subsurface sites diffuse into the bulk at 210 K, from which the activation energy for in-diffusion of 0.56 ± 0.03 eV was determined, and desorb recombinatively at ∼280 K. Upon further exposure to H(g) atoms, as much as 8 MLs of bulk hydride form near the surface region which are decomposed at 200 K giving rise to H2 desorption.

本文言語英語
ページ(範囲)7876-7881
ページ数6
ジャーナルJournal of Physical Chemistry B
103
37
DOI
出版ステータス出版済み - 9 16 1999
外部発表はい

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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