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: ジャーナルへの寄稿学術誌査読

21 被引用数 (Scopus)


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.

ジャーナルJournal of Physical Chemistry B
出版ステータス出版済み - 9月 16 1999

All Science Journal Classification (ASJC) codes

  • 物理化学および理論化学
  • 表面、皮膜および薄膜
  • 材料化学


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