论文部分内容阅读
从电热动力学（Ｅｌｅｃｔｒｏｔｈｅｒｍｏｄｙｎａｍｉｃｓ）角度出发，分析了扫描隧道显微镜（ＳＴＭ）中场蒸发过程．引入了一个有效结合能，并推导得到了ＳＴＭ中的蒸发场强计算公式．用该公式计算得到了与实验一致的金离子的蒸发场强．同时发现传统的电荷交换模型与成象势垒模型，由于它们要求被蒸发原子完全电离并被蒸发到无穷远处，因而对ＳＴＭ计算的蒸发场强偏高．
From the perspective of electrothermodynamics, the field evaporation in scanning tunneling microscope (STM) was analyzed. An effective binding energy is introduced and the formula for calculating the evaporation field in STM is deduced. Calculated with the formula obtained with the experimental gold ionization of the evaporation field strength. At the same time, we find that the traditional model of charge exchange and imaging barrier are higher than the calculated evapotranspiration of STM due to their complete ionization of evaporated atoms and their evaporation to infinity.