Ionization mechanism in a liquid-metal ion source. Source for high-melting metals
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- 作者：G. G. Sikharulidze (1)
- 刊名：Technical Physics
- 出版时间：November 1997
- 出版年：1997
- 期刊代码：pc985_1063-7842
- 类别：ph
- 卷：42
- 期：11
- 页码：1317-1321
- 数据来源：sp
摘要
Investigations have been made of the ionization mechanism in a liquid-metal ion source. At the instant of ion current generation the surface of a liquid metal emitter frozen in a highvoltage field exhibits microprotrusions pulled from the liquid metal by the electric field. A double-focusing mass spectrometer identified two components in the ion beam extracted from the aperture in the extractor. One ion component forms at the tip of the emitter and has an energy spread not exceeding a few tens of electronvolts. The other ion component forms in the cathode plasma at the extractor. On the basis of these investigations, a mechanism is proposed for ion formation in a liquid metal ion source and this mechanism is used to produce a modified source design. The source can produce ion beams from high-melting metals and nonmetals, and beams of Ta, W, Mo, C, and Fe ions were obtained.