Abstract
We measure the activation energy for surface diffusion of isolated Pb adatoms on Ge(111) by observing individual atomic interchanges using a scanning tunneling microscope. The diffusion occurs mainly along one direction of the c(2\ifmmode\times\else\texttimes\fi{}8) reconstructed surface with Pb adatoms moving between substitutional Ge adatom sites. Only half of the adatom interchanges are to near-neighbor sites, the rest are ``long jumps.'' The scanning process does not affect the diffusion. For temperatures from 24 to 79 \ifmmode^\circ\else\textdegree\fi{}C we find the diffusion obeys an Arrhenius law with an activation energy of 0.54\ifmmode\pm\else\textpm\fi{}0.03 eV.
Keywords
Scanning tunneling microscopeActivation energyDiffusionArrhenius equationSurface diffusionMaterials scienceCondensed matter physicsAnisotropyQuantum tunnellingAtomic physicsPhysicsChemistryThermodynamicsOpticsPhysical chemistryAdsorption
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Publication Info
- Year
- 1992
- Type
- article
- Volume
- 68
- Issue
- 10
- Pages
- 1567-1570
- Citations
- 207
- Access
- Closed
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Cite This
Eric Ganz,
Silva K. Theiss,
Ing‐Shouh Hwang
et al.
(1992).
Direct measurement of diffusion by hot tunneling microscopy: Activation energy, anisotropy, and long jumps.
Physical Review Letters
, 68
(10)
, 1567-1570.
https://doi.org/10.1103/physrevlett.68.1567
Identifiers
- DOI
- 10.1103/physrevlett.68.1567