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Faceting of the vicinal Cu(115) and Cu(119) surfaces due to oxygen adsorption was studied by scanning tunnelling microscopy (STM). Both surfaces reconstruct into two kinds of {104}-type facets and a third facet determined by the macroscopic surface orientation. This third facet is {113}-orientated for Cu(115) and {100}-orientated for Cu(119). On all facets Cu-O-Cu chains are developed that are energetically favoured. On oxygen-saturated surfaces (exposure between 100 and 1000 L) the facet size is determined by the foundation kinetics, as could be shown by varying the sample temperature during adsorption (between 410 and 620 K) or by varying the adsorption rate (oxygen pressure between 5.6 x 10-9 and 2 x 10-5 mbar). This facet size dependence can be formally described by equations derived for nucleation and growth mechanisms. But experiments with lower oxygen exposure (10 to 20 L) indicate that the facet formation proceeds in several steps. In that case, small (100)-facets along the step edges can be seen between regions with final reconstruction. An atomistic model for this facet formation is proposed.

Additional information

Authors: REINECKE N, Max-Planck-Institut f³r Plasmaphysik, EURATOM-Association, Garching bei M³nchen (DE);TAGLAUER E, Max-Planck-Institut f³r Plasmaphysik, EURATOM-Association, Garching bei M³nchen (DE)
Bibliographic Reference: Article: Surface Science 454-456 (2000) pp. 94-100
Availability: Surface Science (Journal)
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