The result showed that the composite had excellent field emission characters . the star - up field intensity was 4 . 4v / um and the f - ncurve indicated that the electron emission was leaded by tunnel effect 材料的场发射性能良好，其发射开启场强约为4 . 4v um ， f ? n曲线表明该材料的电子发射主要是由隧道效应引起的。
Scandate cathode has outstanding properties of high emission at low work temperature . it ’ s the only thermionic cathode which can suffice to the development of new electronic device ’ s requirement 含钪扩散阴极具有极其优异的低温高电流密度的电子发射的能力,是目前唯一能满足新型电子器件发展要求的热阴极材料。
The empirical formula in the process of the secondary emission is analyzed ; the stabilization condition of vacuum surface flashover is deduced . the physics image of the vacuum surface flashover is described with the seea theory 本文分析了二次电子发射过程的经验公式，推导了真空表面闪络的稳定条件，以seea理论的观点描述了真空表面闪络发生的物理图象。
The dust charging associated with the electron beams including the secondary emission of dust can dominate the dust surface potential in the close cathode region . in this case , dust of the same size can levitate at two different positions in the cathode 另外还发现：在考虑极板有强电子束发射和尘埃粒子本身的二次电子发射时，同一大小的尘埃粒子能够悬浮在鞘层中两个不同的位置。
Based on the energy band characteristics of ordinary negative electron affinity emitter gaas , the design of lengthening the diffusion lengths of negative electron affinity emitter gaas was presented , and the special negative electron affinity emitter gaas was designed 摘要根据通常负电子亲和势二次电子发射材料砷化镓的能级特点，提出延长负电子亲和势二次电子发射材料砷化镓的逸出深度的理论设计，设计出了特殊的负电子亲和势二次电子发射材料砷化镓。
In this paper based on the theory of the low energy electrons , the movement of the irons in the counter is analyzed . the theories of sputtering and secondary electron emission are discussed respectively . the irons " action and effect on the counter are putted forward 本文从低能电子发射机理入手，分析了计数管内部离子运动情况，讨论了离子溅射和二次电子发射，提出了离子与计数管内壁相互作用及其对计数管的影响，给出了计数管内壁表面处理仿真图。
The properties of these doped powders , the microstructure and composition of these rare - earth co - doped tungsten matrices and cathodes have been investigated by size analysis , xrd , sem and edax . the electronic emission performances of these cathodes are measured in uhv electron emission surveyor . aes is adopted to analyze the atom composition and diffusion behavior of active elements on cathode surfaces 通过粒度分析、 xrd 、 sem 、 edax研究了掺杂粉末的特性、烧结基体和阴极的微观结构和成分;用动态真空电子发射测试仪对上述阴极进行了电子发射水平的测试;采用aes对阴极表面原子组成和活性物质的扩散行为进行了研究,分析了阴极发射水平与表面原子组成的关系。
A new model for the growth stage of surface flashover has been developed according to the experimental results , which is based on the solid band theory . it is suggested that the electron multiplication could be attributed to two processes : one is the secondary electron emission avalanche caused by collisional ionization , the other is the micro - discharge caused by the trap centers of insulator . the trap cente 电子倍增的过程与材料的表面态直接相关，材料微观结构的变化和材料的表面处理都能够导致材料表面态的变化，引起材料的表面二次电子发射系数以及材料中陷阶密度和分布的改变，从而影响了电子倍增的过程，并进一步改变或影响了沿面闪络的发展过程。
This project which is based on the demand of increasing the electron tube ’ s qualities totally and reducing the manufacture cost has done a large amount of investigative work as follows to improve and perfect the technologies for the important part of electron tube manufacture ? the grid surface processing : on the surface processing of the molybdenum grid , the primary purpose is to reduce thermionic emission and secondary electronic emission of the grid . by the constantly experiment and grabbling the different technology routes , we have successfully developed these new technologies on the tac and zrc electrophoresis and electroplating platinum black of the grid , and made its surface cladding quality very stable and reliable 本课题是基于整体提高电子管的质量和降低生产成本的要求,对电子管生产中的重要部分? ?栅极的表面处理技术进行改进和完善,主要在以下方面进行了深入研究:在钼栅极表面处理方面,主要为实现降低栅极的热电子发射和二次电子发射,通过不同工艺路线的不断试验和摸索,成功开发出栅极电泳tac 、 zrc和电镀铂黑的新工艺,使栅极的涂覆质量稳定可靠。
The current density jdiv reaches 50 a / cm2 at 850 b , which has reached the best emission level in the world while its sc2o3 . content reduced . the emission of e3 cathode is non - uniform and the emission capabilities of e1 and e3 cathode are lower than s2 . emission capability of y4 and y6 cathode is similar as that of normal ba - w cathode 测试了阴极的电子发射能力,实验结果显示: y3阴极的发射性能优异, 850 b时直接偏离点电流密度jdiv达到50a / cm2 ,与sc - w基阴极的最好发射记录处在同一个水平; e3阴极的发射不均匀, e1和e3阴极的发射能力均低于s2阴极; y4和y6阴极的发射水平与普通ba - w阴极相接近。
