Abstract
Au(110) surfaces with (1×2)-reconstruction have been investigated using perturbed γγ-angular correlation (PAC) spectroscopy. From the two observed electric-field-gradient tensors at111In probe atoms, deposited at room temperature in a concentration of about 10−4 ML, the occupation of substitutional sites in the densely-packed rows along [110]-directions and ninefold coordinated sites within the (111)-oriented microfacets, respectively, can be concluded. Annealing to about 600 K leads to bulk migration of the In atoms, detected by an increase of probe atoms with cubic surroundings. Due to this behaviour the order-disorder transitions of these surfaces occurring atTc=649 K cannot be detected in our PAC experiments.
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