Composition and structure of the Cu85Pd15(110)-(2x1) surface determined by low-energy ion scattering

被引：31

作者：

Bergmans, RH ^{[1
]}

vandeGrift, M ^{[1
]}

vanderGon, AWD ^{[1
]}

Brongersma, HH ^{[1
]}

机构：

[1] EINDHOVEN UNIV TECHNOL,FAC PHYS,5600 MB EINDHOVEN,NETHERLANDS

来源：

SURFACE SCIENCE | 1996年 / 345卷 / 03期

关键词：

alloys; catalysis; computer simulations; copper; ion-solid interactions; scattering; channeling; low-energy electron diffraction (LEED); low-energy ion scattering (LEIS); low-index single crystal surfaces; palladium; sputtering; surface segregation; surface structure;

D O I：

10.1016/0039-6028(95)00884-5

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：

The composition and structure of the Cu85Pd15(110)-(2x1) surface has been determined by low-energy ion scattering. From time-of-flight forward scattering and recoiling measurements it is concluded that the surface is unreconstructed. The equilibrium composition of the first two atomic layers is determined by comparing the energy and azimuthal distribution of backscattered 2 keV Ne+ ions as obtained with the EARISS (energy and angle-resolved ion scattering spectrometer) with three-dimensional ion trajectory simulations. For the first layer, a slight depletion in Pd is found (11+/-2 at%), whereas the second layer is strongly enriched in Pd (40+/-8 at%). These results are in reasonable agreement with an earlier proposed model [D.J. Holmes, D.A. King and C.J. Barnes, Surf. Sci. 227 (1990) 179]. In addition, the thermal segregation after sputtering at room temperature was investigated which showed similar behavior as was recently reported on Pt10Ni90(110) [P. Weigand, B. Jelinek, W. Hofer and P. Varga, Surf. Sci 295 (1993) 57].

引用

页码：303 / 312

页数：10

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