Frenkel defect interactions at surfaces of irradiated alkali halides studied by non-contact atomic-force microscopy

被引:31
作者
Kolodziej, JJ
Such, B
Czuba, P
Krok, F
Piatkowski, P
Struski, P
Szymonski, M
Bennewitz, R
Schär, S
机构
[1] Jagiellonian Univ, Inst Fiz, PL-30059 Krakow, Poland
[2] Reg Lab Physicochem Anal & Struct Res, PL-30060 Krakow, Poland
[3] Univ Basel, Inst Phys, CH-4056 Basel, Switzerland
关键词
electron-solid interactions; electron stimulated desorption (ESD); atomic force microscopy; surface structure; morphology; roughness; and topography; alkali halides;
D O I
10.1016/S0039-6028(01)00936-0
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Irradiation of alkali halide crystal leads to production of Frenkel defects in the crystal bulk. Subsequent diffusion and interactions of these defects with the surface results in desorption processes at the surface. We have studied surface topography of electron bombarded alkali halide crystals (KBr, NaCl) and the desorption fluxes. It is found that the desorption proceeds in a layer-by-layer mode by growth and linking of pits of monoatomic depth, which results in modulation of surface step density. Electron-stimulated desorption fluxes are correlated with the surface step density. Based on these results it is concluded that H-centers decay at the (100) surface plane with the emission of halogen atoms, F-*-centers recombine with the terrace edge and initiate emission of alkali atoms, and F-centers accumulate in the sub-surface region. Above certain temperature (similar to 450 K for KBr, 370 K for NaCl) the desorption proceeds in more complex, multilayer mode as a result of combination of the above described Frenkel defect mediated mechanism with simultaneous thermal restructuring of the surface. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:903 / 909
页数:7
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