LOW ADATOM MOBILITY ON THE(1 × 2)-MISSING-ROW RECONSTRUCTEDAu(110)SURFACE

S. Günther, A. Hitzke and R. J. Behm
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S. Günther: Abteilung Oberflächenchemie und Katalyse, Universität Ulm, 89069 Ulm, Germany;
A. Hitzke: Abteilung Oberflächenchemie und Katalyse, Universität Ulm, 89069 Ulm, Germany
R. J. Behm: Abteilung Oberflächenchemie und Katalyse, Universität Ulm, 89069 Ulm, Germany

Surface Review and Letters (SRL), 1997, vol. 04, issue 06, 1103-1108

Abstract: Adsorption and mobility ofAuadatoms onAu(110)-(1×2)were studied by low temperature scanning tunneling microscopy (STM). Up to 0.4-monolayer coverage the troughs of the missing row reconstruction are preferentially filled. By following the mobility of individual adatoms at 125 K and 170 K the adatom hopping barrier inside the troughs in the$[1{\bar 1}0]$direction is determined toEd=0.40–0.44 eV, while for diffusion on locally unreconstructed parts of the surface we obtain a lower limit of 0.38 eV. By comparing the cluster size distribution obtained for themally immobile adatoms at 125 K with that from simulations, it is demonstrated that transient mobility plays no significant role inAu/Au(110)self-adsorption. DuringAudeposition at 190 K domain boundaries ("faulted troughs") are observed to form in the1× 2substrate; a tentative mechanism involving exchange diffusion ofAuadatoms is proposed.

Date: 1997
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DOI: 10.1142/S0218625X97001371

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