REFLECTION OF HYDROGEN-ATOMS FROM ALKALI AND ALKALINE-EARTH OXIDE SURFACES

被引:20
作者
MELNYCHUK, ST
SEIDL, M
机构
[1] Stevens Institute of Technology, Hoboken
来源
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS | 1991年 / 9卷 / 03期
关键词
D O I
10.1116/1.577480
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Negative hydrogen ions were produced by scattering thermal energy H atoms with a Maxwellian distribution, from converter surfaces consisting of thick coatings of barium oxide, a mixture of cesium oxides and cesium carbonate, cesium oxides produced by decomposition of cesium carbonate, and submonolayer coatings of cesium on polycrystalline Mo. The H- ion yields and the ratio of electrons to ions were measured as a function of the incident H atom temperature for each of the converter surfaces. The ion yield and the electron to ion ratio were found to depend strongly on the temperature of the incident H atoms, and on the work function of the surface. The best results were obtained with the cesium oxide converter. H- yields from the cesium oxide were above 1% at H atom temperatures above 0.22 eV, and the surface was stable in a flux of atomic hydrogen of 10(16) atoms/cm2/s for over 20 h of exposure time with no deterioration in performance.
引用
收藏
页码:1650 / 1656
页数:7
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