基于汤逊气体放大电子雪崩模型和一定的物理假设，导出描绘气体探测器中正比模式和有限正比模式的一个统一公式。
Based on Towsend s avalanche mode and some basic physical ideas, a unified formula for gas amplification working under proportional mode and limited proportional mode is deduced.
介绍了图形发生器的作用及电子束在控制系统作用下在基片上描绘图形的过程。
The principles and features of raster scan, the function of the pattern generator and the process of the electron beam writing on the substrate under the control system are also introduced.
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