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
收藏
页码：333 / 337
页数：5
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