Calculation method of secondary electron yield based on first principle

Abstract

The invention relates to a secondary electron yield calculation method based on a first principle, and the method comprises the steps: obtaining an energy loss function and a surface work function of a material through the calculation of the first principle; and tracking each scattering collision process of each electron in the material according to the energy loss function and the surface work function by using a Monte Carlo simulation method, and obtaining the secondary electron yield of the material by counting all emergent electrons. According to the method, secondary electron calculation does not need to depend on experimental data any more, if parameters related to materials are obtained through experiments, the cost is high, the bottleneck is broken, and a backstepping fitting method for measuring the secondary electron emission coefficient through the experiments is not adopted; and the method has good universality and popularization value.

Description

technical field [0001] The invention relates to a calculation method of secondary electron yield. Background technique [0002] In recent years, with the development of some electronic industries such as space electronics technology, high-energy physics experiments, and surface microanalysis technology, secondary electron emission, as a widespread physical phenomenon, has attracted more and more extensive research. At present, many problems are caused by the emission of secondary electrons, such as the electron cloud of the particle accelerator, the electrification of the surface of the space vehicle, and the performance degradation of components, especially the micro-discharge effect of high-power microwave components. Due to the variety of materials and the limitation of test conditions, it is of great significance to accurately calculate the secondary electron emission yield of materials without relying on experimental measurements for predicting and avoiding secondary el...

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Problems solved by technology

The momentum transfer and energy exchange in the inelastic scattering process of electrons based on the superposition theory of dispersion-relational plane waves can be obtained according to the energy loss function, while the energy loss spectrum of dielectric materials often depends on the experimental optical data that is difficult to obtain, so many materials (especially my country's aerospace The inelastic scattering process of the unique material of the load cannot be calculated, which eventually makes it difficult to simulate the whole process of the movement of electrons in the material, and the obtained simulation results of scattered charges have a large deviation from the actual situation.

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