Abstract
The growth of Pd on MgO(001) has been investigated by grazing incidence X-ray scattering. Deposits in the range of 0.2 to 183 monolayers (ML) were analyzed in situ, in UHV. The growth proceeds by nucleation and growth of islands from 0.2 ML. The coalescence starts around 18 ML and is complete at 35 ML. Pd is in cube-on-cube epitaxy with respect to MgO(001), and has a lattice parameter close to that of bulk Pd. The epitaxial site, above oxygen ions of the substrate, and the interfacial distance (2.22±0.02 Å for 1 ML of Pd deposited) were determined for the first time as a function of the amount of Pd deposited, by a quantitative analysis of the substrate crystal truncation rods.
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