QUASI-LIQUID MOLECULAR LAYER AT SOLID HYDROGEN SURFACES

被引：23

作者：

MARUYAMA, M

BIENFAIT, M

LIU, FC

LIU, YM

VILCHES, OE

RIEUTORD, F

机构：

[1] CNRS,CRMC2,F-13288 MARSEILLE 9,FRANCE

[2] UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195

[3] ILL GRENOBLE,F-38042 GRENOBLE,FRANCE

来源：

SURFACE SCIENCE | 1993年 / 283卷 / 1-3期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0039-6028(93)90999-Z

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：

Quasi-elastic neutron scattering has been applied to characterize the surface-mobile layer of films of HD (an isotope of molecular hydrogen) condensed on MgO powder in the coverage range 1-5 layers and the temperature range 7-15 K (T(m) = 16.6 K). The close-packed surface has a diffusivity from about 8 K, with 0.3 mobile layers and a diffusion coefficient of 1/3 that of bulk liquid HD at T(m). The mobile quantity increases with temperature. The diffusion coefficients are in the range (0.8-2.0) x 10(-5) cm2/s, and follow an Arrhenius-type temperature dependence with an activation energy of 16.1 K. The partial order remains in the mobile layer where HD molecules jump from site to site on a hexagonal lattice.

引用

页码：333 / 337

页数：5

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