Work function of the adsorption system of potassium on tungsten

Błaszczyszyn, R.; Błaszczyszyn, M.; Męclewski, R.

doi:10.1016/0039-6028(75)90390-8

Cited by 58 publications

(7 citation statements)

References 22 publications

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“…As it can be seen in curve 1, φ decreases initially with increasing θK, reaches its minimum value φ min = 1.79 eV and then increases monotonically up to the saturation value φsat = 2.21 eV. The shape of the curve 1 is typical for the adsorption of potassium on tungsten and similar to the curves reported in [2,3,5,7,8,9].…”

Section: Methodssupporting

confidence: 80%

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

Dworecki¹

1992

Acta Phys. Pol. A

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The adsorption and coadsorption of beryllium and potassium on the tungsten (001) plane was studied using a probe-hole field ełectron 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 ) o n t h e W ( 0 0 1 ) p l a n e 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 experimentał results with the theoretical models suggested recently.

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Section: Methodssupporting

confidence: 80%

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

Dworecki¹

1992

Acta Phys. Pol. A

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“…2 it follows that this model gives the same trend of the function Nm (d) as calculated by Lan g [6]. The same trend is also observed experimentally [14,15] in contradiction to the results obtained by Yamauchi and Kawabe [3], and by Bigun [4].…”

Section: Model Of the Trial Sedpsupporting

confidence: 68%

Analytical Representation of Charge-Density Profile at a Jellium Surface Covered with the Alkali Metal Submonolayers

1991

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Α simple trial function for the electron density profiles at the surface of iebum covered by a submonolayerof alkafi adatoms is proposed. The values of work function changes due to adsorption, computed by use of this function, are in good agreement with experimental data. It is shown also that the proposed earlier trial functions for the electron density profiles at the metal surface covered by metallic adlayers, give a wrong sequence of surface concentration of adatoms, at which the minimum of work function for different adsorbates occurs.

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“…The emitter temperature was determined measuring the changes of resistance of a loop segment. The sulfur and potassium sources used in these experiments were similar to those described elsewhere [3,4].…”

Section: Methodsmentioning

confidence: 99%

Thermal Desorption of Potassium from Clean and Sulfur Covered Nickel

1995

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Activation energy for thermal desorptioii of potassium from clean and sulfur covered surfaces of nickel was determined by means of the field emission method. For the low potassium coverage limit (θK 0.02) the desorption was detected from the whole emitter surface in the temperature range of 825-1000 K for the atoms and of 725-825 K for the species of atoms and ions of the potassium. The activation energies of neutral desorption were found to be EaNi = 3.8 eV for the clean nickel and Es /Ni = 3.0 eV for the sulfur covered nickel, θs 0.5. The activatioii energies for the desorptioii of the species of atoms and ions increased from E ti = 2.5 eV for the clean nickel to Ea+iS/Ni = 2.9 eV for the sulfur covered nickel θs 0.5. Also, a value of Ea+iS'/Ni = 4.1 eV was found for a higher coverage of sulfur, θs 1. The results are discussed in terms of Gurney model.

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Work function of the adsorption system of potassium on tungsten

Cited by 58 publications

References 22 publications

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

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

Analytical Representation of Charge-Density Profile at a Jellium Surface Covered with the Alkali Metal Submonolayers

Thermal Desorption of Potassium from Clean and Sulfur Covered Nickel

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