HELIUM-ATOM SCATTERING INVESTIGATION OF FACETING OF THE AL STEPPED (332) SURFACE

被引:73
作者
HINCH, BJ [1 ]
LOCK, A [1 ]
MADDEN, HH [1 ]
TOENNIES, JP [1 ]
WITTE, G [1 ]
机构
[1] MAX PLANCK INST STROMUNGSFORSCH,W-3400 GOTTINGEN,GERMANY
来源
PHYSICAL REVIEW B | 1990年 / 42卷 / 03期
关键词
D O I
10.1103/PhysRevB.42.1547
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Helium-atom scattering has been used to study the facetting of an aluminum crystal that was cut at an angle of 10.0°from the (111) face to produce a (332) periodically stepped surface. After initial surface preparation of repeated sputtering and annealing cycles, the diffraction peak structures indicated strong facetting. Data collected for a wide range of initial He-atom wave vectors between 4.3 AÌ-1 (9.7 meV) and 12.5 AÌ-1 (81.8 meV) along the [1» 1»3] azimuth reveal well-formed (111), disordered (221), and a small proportion of (113) facets. The identification of facets is made relatively easy with He-atom scattering due to the large form factors for individual steps. From studies of the temperature dependence, three temperature ranges were identified. At the highest investigated surface temperatures (TAl>650 K), (111) and (221) facets build up and predominate. For intermediate temperatures (650 K>TAl>500 K) the macroscopic (332) face begins to form. At lower temperatures the surface is sufficiently immobile to inhibit a redistribution between facets. However, (221) facets do show a temperature-dependent roughness down to 300 K. The instantaneous long-range step distribution freezes in at TAl*500 K. © 1990 The American Physical Society.
引用
收藏
页码:1547 / 1559
页数:13
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