Analysis of fractional order thermal desorption

  • Sodium on a LiF(100) single crystal surface has been studied by thermal desorption. With increasing coverage the spectra exhibit a pronounced shift to higher desorption temperatures. We find that the results can be explained by fractional order desorption kinetics where the order of desorption is x=0.79±0.08. In addition, activation energies have been extracted. They vary between 0.55 and 0.8 eV for coverages ranging from 5×1013 to 1017 atoms/cm2. An analysis of fractional order thermalSodium on a LiF(100) single crystal surface has been studied by thermal desorption. With increasing coverage the spectra exhibit a pronounced shift to higher desorption temperatures. We find that the results can be explained by fractional order desorption kinetics where the order of desorption is x=0.79±0.08. In addition, activation energies have been extracted. They vary between 0.55 and 0.8 eV for coverages ranging from 5×1013 to 1017 atoms/cm2. An analysis of fractional order thermal desorption is presented and the desorption energies are discussed. The results are interpreted in the framework of a microscopic model where sodium atoms desorb from the edges of Nan-clusters formed by adatom diffusion on the LiF insulator surface.show moreshow less

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Metadaten
Author:Michael Vollmer, Frank Träger
Parent Title (English):In: Surface Science Vol. 187 (1987) 2–3, pp 445–462
Document Type:Article
Language:English
Year of Publishing:1987
Date of Publication (online):2014/01/13
Release Date:2014/01/13
First Page:445
Last Page:462
Institutes:Fachbereich Technik
Dewey Decimal Classification:Naturwissenschaften und Mathematik / Physik / Physik
University Bibliography:Hochschulbibliographie
Licence (German):Creative Commons - Namensnennung, Nicht kommerziell, Keine Bearbeitung