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Desorption kinetics of Li atoms from LiF under electron bombardment
- Source :
- Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 58:490-495
- Publication Year :
- 1991
- Publisher :
- Elsevier BV, 1991.
-
Abstract
- Measurements on electron stimulated desorption (ESD) of Li atoms in the electronical ground state (Li 0 ) from air-cleaved LiF(100) surfaces have been performed. The electron energy was varied between 50 and 450 eV. After electron bombardment was stopped, a prompt decrease of the Li 0 signal followed by a delayed emission of Li 0 was observed. In the temperature range from 620 to 720 K the delayed emission of Li 0 shows a behavior, which could not be explained by diffusion of F centers to the surface only. Delayed emission of Li 0 up to minutes was observed and we therefore suggest, that energy must be stored in the bulk through the formation of F center aggregates in order to explain the experimentally observed behavior of the delayed emission. A system of rate equations has been developed, which describes the kinetics of formation and decay of F center aggregates.
Details
- ISSN :
- 0168583X
- Volume :
- 58
- Database :
- OpenAIRE
- Journal :
- Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
- Accession number :
- edsair.doi...........62bb53a2120b7b196dbd4105419be6ab