Current-voltage characteristics of a gas field ion source with a supertip
Current-voltage characteristics of a gas field ion source with a supertip
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超尖端气体场离子源的电流-电压特性
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
S. Kalbitzer
中科院分区：
文献类型：
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作者：
R. Börret;K. Böhringer;S. Kalbitzer
对氢和较轻的稀有气体的场电离特性进行了研究。参数设置包括叶尖温度、叶尖半径、气体温度和气体压力。由于在超尖端位置的局部场增强，在气体尖端系统的最佳温度附近获得了35 μ A sr-1的角电流强度和1010 A cm-2 sr-1的亮度值。在低于这个温度时，气体密度达到冷凝相的典型值。在几何比例上，规则尖端区域似乎充当了超级尖端电流的气体供应
The field ionization properties of a supertip, a fine protrusion on top of a regular emitter, have been studied for hydrogen and the lighter rare gases. The parameter set included tip temperature, tip radius, gas temperature and gas pressure. Due to the local field enhancement at the supertip site, angular current intensities of 35 mu A sr-1 and values of brightness up to 1010 A cm-2 sr-1 have been obtained near the optimum temperature of the gas-tip system. At temperatures below this, the gas density reaches values typical for a condensed phase. In geometrical proportion, the regular tip area appears to serve as a gas supply for the supertip current