Coadsorption of Beryllium and Potassium on a (001) Tungsten Plane

• Authors: Z. Dworecki
• Languages of publication: EN

Abstracts

EN

The adsorption and coadsorption of beryllium and potassium on the tungsten (001) plane was studied using a probe-hole field electron microscope (FEM). Measurements were made at 78 K for potassium and at 300 K for beryllium. It has been found that the adsorption of potassium decreases and that of beryllium increases the work function of the W(001) plane. At small coverages with potassium atoms (θ_{k} < 0.2) on the W(001) plane successive evaporation of beryllium atoms causes a decrease of the work function. At larger coverages with potassium atoms an opposite effect is observed. An attempt has been made to compare the experimental results with the theoretical models suggested recently.

Keywords

EN

61.55.Hg; 73.30.+y; 79.70.+q

Discipline

• 79.70.+q: Field emission, ionization, evaporation, and desorption
• 73.30.+y: Surface double layers, Schottky barriers, and work functions(see also 82.45.Mp Thin layers, films, monolayers, membranes in electrochemistry; see also 87.16.D- Membranes, bilayers, and vesicles in biological physics)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1992
• Volume: 81
• Issue: 1
• Pages: 125-129

Dates

published

1992-01

received

1991-05-25

Contributors

author

Z. Dworecki

• Institute of Physics, Pedagogical University, Oleska 48, 45-052 Opole, Poland

Identifiers

DOI

10.12693/APhysPolA.81.125