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材料的二次电子发射现象是1899年科学家坎贝尔发现的,至今已有80多年的历史了。二次发射现象在工业生产和科学研究上有重要的应用,在许多电子器件和仪器中都利用了这一现象,如在电子倍增器,磁控管,和存贮管中,以及在扫描电镜,电子束焊机中。但是,如果对二次发射现象处理不当,就会引起表面带电,甚至造成电击穿。如在高压电真空器件中的击穿、卫星表面的带电击穿等,造成严重的后果。因此,几十年来对二次电子发射的研
Secondary electron emission of materials was discovered by scientist Campbell in 1899 and has been more than 80 years old. The phenomenon of secondary emission has important applications in industrial production and scientific research and has been exploited in many electronic devices and instrumentation such as electron multipliers, magnetrons, and storage tubes, as well as in scanning electron microscopy , Electron beam welding machine. However, if the secondary emission phenomenon is not properly handled, it will cause surface charge, and even cause electrical breakdown. Such as breakdown in high voltage electrical vacuum devices, charged breakdown of satellite surfaces, etc., with serious consequences. Therefore, decades of research on secondary electron emission