ELECTROHYDRODYNAMIC ION SOURCE

被引:96
作者
MAHONEY, JF
YAHIKU, AY
DALEY, HL
MOORE, RD
PEREL, J
机构
[1] Electro-Optical Systems, Pasadena
关键词
D O I
10.1063/1.1657359
中图分类号
O59 [应用物理学];
学科分类号
摘要
An electrohydrodynamic (EHD) technique is used to generate ions from liquid metals. Liquid metal is fed to the tip of a capillary needle emitter with a voltage difference applied between the emitter and an extractor electrode to produce an intense electric field at the liquid surface. Electrostatic forces overcome surface tension forces to produce ions by field emission. When using liquid cesium, time-of-flight mass analysis showed the ion current to be primarily Cs+ with a small percentage of Cs2+ and Cs3+. Electron currents of over 1 mA have been produced by operating the emitter at 2 kV negative. Besides cesium, alkali ion beams have been generated using NaK/cesium alloy and sodium. Calculations show that liquid metals of low work functions appear more suitable for production of atomic ions while higher work functions metals may produce multiatomic ions and charged droplets in addition to atomic ions. © 1970 The American Institute of Physics.
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页码:5101 / &
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