Abstract
For Pd clusters on gamma-Al2O3 epitaxially grown on NiAl(110) the
lattice constant has been determined as a function of the cluster
size by evaluating patterns induced by double diffraction involving
the NiAl substrate and the cluster lattice. Similar to results reported
previously for platinum and tantalum clusters on the same substrate
(Surf. Sci. 1997, 391, 27; Surf. Sci. 1998, 413, 192), we observe
a reduction of the distances within the lattice with decreasing cluster
size. The highest observed reduction is 5% for clusters with a diameter
of about 12 �. Within the limits of the experimental errors the reduction
of the lattice distances is isotropic. Although the samples have
been exposed to air prior to investigation, the clusters are only
weakly oxidized as concluded from XPS data.
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