Diffusion of Potassium on the W(112) Plane Preadsorbed by Ni Atoms: Field Emission Current Fluctuations - Autocorrelation Study

• Authors: T. Biernat , R. Błaszczyszyn , Ch. Kleint
• Languages of publication: EN

Abstracts

EN

Diffusion of potassium adsorbate on the W(112) plane with preadsorbed nickel was investigated by means of the autocorrelation function of field emission current fluctuations. A comparison of the experimental autocorrelation function with that of a theoretical calculation by Gesley and Swanson gives the surface diffusion coefficient of potassium. From its temperature dependence the diffusion activation energy at several Ni pre-coverages for a constant potassium coverage (Θ_K=0.4) is derived. The dependence of the activation energy for potassium surface diffusion on the nickel coverage - first reduction and then an increase with increasing Ni coverage - is observed. This is in agreement with the results obtained from the spectral analysis of the field emission current fluctuations of the same system. The decrease is understood to be a result of the smoothing effect caused by Ni atoms on the W(112) plane.

Keywords

EN

79.70.+q; 68.37.Vj; 68.43.Jk; 05.40.Ca

Discipline

• 05.40.Ca: Noise
• 79.70.+q: Field emission, ionization, evaporation, and desorption
• 68.43.Jk: Diffusion of adsorbates, kinetics of coarsening and aggregation
• 68.37.Vj: Field emission and field-ion microscopy

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 99
• Issue: 6
• Pages: 665-672

Dates

published

2001-06

received

2000-12-11

(unknown)

2001-05-14

Contributors

author

T. Biernat

• Institute of Experimental Physics, University of Wrocław, Pl. Maxa Borna 9, 50-204 Wrocław, Poland

author

R. Błaszczyszyn

• Institute of Experimental Physics, University of Wrocław, Pl. Maxa Borna 9, 50-204 Wrocław, Poland

author

Ch. Kleint

• Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnéstr. 5, 7010 Leipzig, Germany

References

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Identifiers

DOI

10.12693/APhysPolA.99.665