Highly site-specific H2 adsorption on vicinal Si(001) surfaces

Details Highly site-specific H2 adsorption on vicinal Si(001) surfaces Highly site-specific H2 adsorption on vicinal Si(001) surfaces

1998-11-17

arxiv.org/abs/cond-mat/9811241v1

Physics

Condensed Matter

5 pages, 4 figures, submitted to Phys. Rev. Lett. (1998). Other related publications can be found at http://www.fhi-berlin.m

Scientific paper

10.1103/PhysRevLett.81.5596

Experimental and theoretical results for the dissociative adsorption of H_2 on vicinal Si(001) surfaces are presented. Using optical second-harmonic generation, sticking probabilities at the step sites are found to exceed those on the terraces by up to six orders of magnitude. Density functional theory calculations indicate the presence of direct adsorption pathways for monohydride formation but with a dramatically lowered barrier for step adsorption due to an efficient rehybridization of dangling orbitals.

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