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Physical Review Letters

Volumn 74, Issue 11, 1995, Pages 2058-2061

Brownian motion of vacancy islands on Ag(111)

(4) Morgenstern, Karina a Rosenfeld, Georg a Poelsema, Bene b Comsa, George a

a FORSCHUNGSZENTRUM JÜLICH (Germany)

b UNIVERSITY OF TWENTE (Netherlands)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 1642304512 PISSN: 00319007 EISSN: None Source Type: Journal
DOI: 10.1103/PhysRevLett.74.2058 Document Type: Article

Times cited : (179)

References (17)

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16
- 84927500114
- By measuring the diffusivity at different temperatures, an activation barrier for diffusion of the vacancy islands could be determined. This barrier would correspond to the rate limiting step in the diffusion process, i.e., presumably detachment of kink atoms onto the terrace. Here, we provide a crude estimate for the involved activation barrier in a formal way. For this purpose we define a diffusion frequency by νD=4D/l02, where l0 is a formal single jump length of the vacancy island corresponding to the motion of one adatom across the vacancy island l0=a02/d, with a0=0.289 nm the lattice constant for Ag(111). Hence, νD=4Dd2/a02. Using Dd2=4.9 nm4/sec, derived from Fig. 4 and a “usual” prefactor of 1012sec-1, we obtain an activation energy of 0.5 eV. Compared to calculated values for the emission of adatoms from kink sites [c3], this is a reasonable result.

17
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- Note that the equilibration of the shape of the vacancy islands on Pt(111) at 700 K has been demonstrated to be dominated by the same process
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