Phys. Rev. Lett. 70, 1631–1634 (1993)Electric field inhibition and promotion of exchange diffusion on Pt(001)Received 17 September 1992; published in the issue dated 15 March 1993 Direct observations of a Pt adatom migrating on the Pt(001) plane in the presence of an externally applied electric field show that a positive field raises, and a negative field lowers, the activation barrier for the adatom–substrate-atom exchange process. At field strengths of 1.5 V/Å and above, inhibition of the exchange mechanism is sufficient to change the diffusion mode from exclusively exchange displacements to a mode that includes hops. The effect of the electric field is explained by an electron-transfer process which changes the bonding of the adatom to neighboring surface atoms. © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.70.1631
DOI:
10.1103/PhysRevLett.70.1631
PACS:
61.16.Fk, 66.30.Fq, 68.35.Fx
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