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新型平场发射阴极上单个发射点的扫描显微镜Novel scanning microscope for visualization of individual emission sites on flat field emission cathodes |
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| 课程网址: | http://videolectures.net/slonano07_nemanic_nsm/ |
| 主讲教师: | Vincenc Nemanič |
| 开课单位: | 约瑟夫·斯特凡学院 |
| 开课时间: | 2008-02-12 |
| 课程语种: | 英语 |
| 中文简介: |  |
| 课程简介: | We present first results obtained by a novel scanning projection field emission microscope (SPFEM) designed to study flat broad-area field emission cathodes. The instrument merges capabilities of measuring the electron field emission current from an individual emitting site and genuine projection of electrons onto a luminescent screen. This is achieved by an optimized shape of the anode probe having a 0.04 mm aperture which generates an uniform macroscopic electric field across the investigated area of the cathode. This fact also enables presentation of the relation between the current density and the applied electric field. The magnification of the electron-optical system alone was calculated by computational modeling for some cathode – probe distances and for some voltages. The unique SPFEM performance is demonstrated on smooth sulfur doped nanodiamond films synthesized on molybdenum substrates. |
| 关 键 词: | 投影场发射显微镜; 广域发射; 阳极探针 |
| 课程来源: | 视频讲座网 |
| 最后编审: | 2020-07-24：yumf |
| 阅读次数: | 46 |