ROTATIONAL TUNNELING OF AMMONIA ON MGO (100) SURFACES

被引：5

作者：

HAVIGHORST, M ^{[1
]}

PRAGER, M ^{[1
]}

CODDENS, G ^{[1
]}

机构：

[1] CEA,LAB LEON BRILLOUIN,CNRS,F-91191 GIF SUR YVETTE,FRANCE

来源：

CHEMICAL PHYSICS LETTERS | 1994年 / 222卷 / 1-2期

关键词：

D O I：

10.1016/0009-2614(94)00315-7

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：

Ammonia molecules adsorbed as 0.6 monolayers on MgO (100) surfaces were investigated by neutron spectroscopy. The observed lines at 0.47, 1.59 and 2.04 meV can be interpreted in terms of hindered one-dimensional rotation around the molecular symmetry axis in a potential of higher than threefold symmetry. This is the first observation of rotational tunnelling of a polar molecule bound to an ionic surface. Model calculations on the basis of atom-atom potentials show that the rotational potential is not due to interactions with the substrate.

引用

页码：113 / 116

页数：4

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