Abstract
The coverages, θ, and displacements of Ni atoms associated with the (1 × 2), (2 × 1) and streaked-(1 × 2) phases produced by adsorption of deuterium on Ni(110) have been determined by nuclear reaction analysis (NRA) and Rutherford backscattering (RBS). The (2 × 1) phase formed by adsorption of deuterium at 175 K is un-reconstrueted and is best developed at θ = 1.00 ± 0.05 monolayers. The reconstructed (1 × 2) phase, ( θ = 1.50 ± 0.05 monolayers) has an entire monolayer of Ni atoms displaced laterally by ≳ 0.01 nm. This phase tranforms to the streaked-(1 × 2) phase at T ≳ 200 K with loss of ∼ 0.4 monolayers of deuterium. The streaked phase is also reconstructed with ∼ 20% of a monolayer of Ni atoms displaced by > 0.01 nm. The saturation coverage in the streaked-(1 × 2) phase formed by slow cooling in D 2 from 400 K is 1.7 ± 0.05 monolayers at 175 K.
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