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1995 | 88 | 6 | 1151-1160
Article title

Thermal Desorption of Potassium from Clean and Sulfur Covered Nickel

Content
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Languages of publication
EN
Abstracts
EN
Activation energy for thermal desorption 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 (Θ_{K} ≈ 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 E^{a}_{Ni} = 3.8 eV for the clean nickel and E^{a}_{S/Ni} = 3.0 eV for the sulfur covered nickel, Θ_{s} ≈ 0.5. The activation energies for the desorption of the species of atoms and ions increased from E^{a+i}_{Ni} = 2.5 eV for the clean nickel to E^{a+i}_{S/Ni} = 2.9 eV for the sulfur covered nickel Θ_{s} ≈ 0.5. Also, a value of E^{a+i}_{S'/Ni} = 4.1 eV was found for a higher coverage of sulfur, Θ_{s} ≈ 1. The results are discussed in terms of Gurney model.
Keywords
EN
Publisher

Year
Volume
88
Issue
6
Pages
1151-1160
Physical description
Dates
published
1995-12
received
1995-05-31
(unknown)
1995-07-18
Contributors
  • Institute of Experimental Physics, University of Wrocław, Pl. Maxa Borna 9, 50-204 Wrocław, Poland
  • Institute of Experimental Physics, University of Wrocław, Pl. Maxa Borna 9, 50-204 Wrocław, Poland
author
  • Institute of Experimental Physics, University of Wrocław, Pl. Maxa Borna 9, 50-204 Wrocław, Poland
References
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv88z612kz
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