DESORPTION-KINETICS OF LI ATOMS FROM LIF UNDER ELECTRON-BOMBARDMENT

被引：8

作者：

KREITSCHITZ, O

POLSTER, C

HUSINSKY, W

BETZ, G

机构：

[1] Institut für Allgemeine Physik, Technische Universität Wien, A-1040 Wien

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 1991年 / 58卷 / 3-4期

关键词：

D O I：

10.1016/0168-583X(91)95890-P

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Measurements on electron stimulated desorption (ESD) of Li atoms in the electronical ground state (Li0) 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 Li0 signal followed by a delayed emission of Li0 was observed. In the temperature range from 620 to 720 K the delayed emission of Li0 shows a behavior, which could not be explained by diffusion of F centers to the surface only. Delayed emission of Li0 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.

引用

页码：490 / 495

页数：6

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