DETERMINATION OF HYDROGEN SURFACE COVERAGE OF PT0.5NI0.5 SINGLE-CRYSTALS BY NRA

被引：8

作者：

FALLAVIER, M ^{[1
]}

HJORVARSSON, B ^{[1
]}

BENMANSOUR, M ^{[1
]}

THOMAS, JP ^{[1
]}

机构：

[1] UNIV UPPSALA,DEPT PHYS,S-75121 UPPSALA,SWEDEN

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 1992年 / 64卷 / 1-4期

关键词：

D O I：

10.1016/0168-583X(92)95442-T

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The H-1(N-15, alpha-gamma)C-12 resonant nuclear reaction has been used to measure the hydrogen coverage on the (110) and (111) faces of Pt0.5Ni0.5 single crystals. Surface treatments prior to adsorption experiments as well as beam-induced defects have been investigated for ensuring a correct determination of the hydrogen concentration. Hydrogen coverage has been measured from 115 to 400 K in the 10(-8)-10(-4) mbar H2 pressure range. The maximum coverage is one monolayer on the (110) face and 0.2 monolayer on the (111) face. An interpretation for these low values, compared with the coverage of Ni(110) and Pt(111), is proposed. The composition variation of the first three atomic layers of the crystals accounts for this difference.

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页码：83 / 87

页数：5

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