Hydrogen-induced structural changes on NiAl(110)

被引：15

作者：

Hanbicki, A ^{[1
]}

Davis, HL ^{[1
]}

Baddorf, AP ^{[1
]}

Poker, DB ^{[1
]}

Plummer, EW ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831

来源：

SURFACE SCIENCE | 1996年 / 365卷 / 01期

关键词：

alloys; atom-solid interactions; hydrogen; low energy electron diffraction (LEED); NiAl; surface relaxation and reconstruction; X-ray scattering; diffraction; and reaction;

D O I：

10.1016/0039-6028(96)00851-5

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：

LEED I-V/analysis and surface X-ray scattering measurements have been used to determine the structural changes induced by the adsorption of atomic hydrogen on NiAl(110) at 130 K. The clean surface, ordered with 50at% Ni-50at%Al, relaxes away from bulk truncation to exhibit a large ripple. At 130 K the rippling (Al out, Ni in) is 0.19 Angstrom, as determined by LEED I-V The adsorption of atomic hydrogen reduces this rippling by 16% at half of saturation coverage and at full saturation by 44%. Saturation coverage was measured to be one hydrogen atom per (1x1)surface unit cell(1 monolayer) using nuclear reaction analysis. This observation contradicts first principles calculations that predict 1 monolayer of H removes the surface rippling.

引用

页码：L639 / L646

页数：8

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