The theory of the workfunction of caesium suboxides and caesium films
The theory of the workfunction of caesium suboxides and caesium films
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铯低氧化物和铯薄膜的功函数理论
DOI：
10.1088/0022-3719/11/5/016
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
V. Heine
中科院分区：
文献类型：
--
作者：
M. Burt;V. Heine
与块状铯相比，铯单层薄膜的功函数较低，这被解释为尺寸效应。根据不确定性原理，限制在单层中会提高电子动能，从而提高费米能，导致功函数相应下降。由于每个原子的电子密度低，这种效应对于碱金属来说是显着的。提出了一个简单的计算来证实这一说法。提出了这样的假设：这种尺寸效应对于确定铯低氧化物的功函数也很重要。提出了铯低氧化物电子结构的简单模型，其中它们被视为由接近铯金属的区域和其他区域组成，其他区域被氧离子占据，氧离子对传导电子具有高度排斥性。
The lower workfunction of caesium monolayer films compared with that of bulk caesium is explained as a size effect. By the uncertainty principle, confinement to a monolayer raises the electron kinetic energy and hence the Fermi energy leading to an equivalent fall in workfunction. This effect is substantial for alkali metals because of the low density of electrons per atom. A simple calculation is presented to substantiate this claim. The hypothesis that such a size effect is also important in determining the workfunction of the caesium suboxides is proposed. A simple model of the electronic structure of the caesium suboxides is proposed in which they are viewed as composed of regions approximating caesium metal with other regions, occupied by oxygen ions, which are highly repulsive to conduction electrons.