Abstract
The structure of the (1 × 2) “streaky phase” formed upon adsorption of deuterium on Ni(110) was studied using He scattering. The presence of a pronounced rainbow pattern in the in-plane-spectra observed with the beam incident along [001] signals unambiguously that the “streaky phase” is of the missing-row structure type. The corrugation of the (1 × 2) troughs could be determined as ~ 1.55 Å, which represents an increase of ~ 0.3 Å with respect to the estimated corrugation of a clean Ni-missing-row surface; this observation suggests that the deuterium atoms occupy sites near the ridges of the missing-row troughs. From out-of-plane measurements of the remnant (2 × 1) phase, the fraction of unreconstructed Ni domains coexisting with the missing-row structure has been estimated as 10%.
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