Diffusion of hydrogen on Ni(111) over a wide range of temperature: Exploring quantum diffusion on metals

被引：93

作者：

Cao, GX ^{[1
]}

Nabighian, E ^{[1
]}

Zhu, XD ^{[1
]}

机构：

[1] UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.79.3696

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measured the temperature and azimuthal dependence of the diffusion rates of hydrogen (H-1) and deuterium (H-2) on Ni(111) from 65 to 240 K where the diffusion rates vary by 8 orders of magnitude. The diffusion of hydrogen crosses over from an activated behavior above 110 K to another activated behavior below 110 K with a smaller activation energy. By ruling out the possibility of a step effect, we suggest that the crossover is from a classical overbarrier hopping to a quantum mechanical underbarrier tunneling. [S0031-9007(97)04429-3].

引用

页码：3696 / 3699

页数：4

共 34 条

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[2]

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