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Thermal-annealing studies of defects in lithium fluoride after electron-beam irradiation

Journal Article · · Physical Review, B: Condensed Matter; (USA)
; ;  [1]
  1. Institut fuer Allgemeine Physik, Technische Universitaet Wien, Wiedner Hauptstrasse 8-10, A-1040 Wien, Austria (AT)
We have bombarded single-crystal LiF surfaces with 400-eV electrons at fixed target temperatures between 330 and 470 K and varied the irradiation time between 30 and 4200 sec. After irradiation we heated the crystals up to 750 K and simultaneously recorded the Li desorption. Interpreting the amount of desorbed Li atoms as a measure for frozen electron-center defects and Li agglomerates in the crystal, we were able to obtain an activation energy for the thermal migration of the {ital H} centers of about 0.13 eV. Investigations, where the bombarding time has been varied, indicate efficient {ital H}-center trapping processes and different lifetimes for {ital H}-center clusters of different sizes in the crystal. In addition, we found evidence for a substantial formation of {ital F}-center agglomerates under the surface and Li islands on the surface.
OSTI ID:
5751668
Journal Information:
Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:8; ISSN 0163-1829; ISSN PRBMD
Country of Publication:
United States
Language:
English

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