Highly monochromatic electron point‐source beams
Highly monochromatic electron point‐source beams
复制标题
高度单色电子点源束
DOI：
10.1063/1.112746
复制
发表时间：
1994
影响因子：
4
通讯作者：
H. Fink
中科院分区：
文献类型：
--
作者：
R. Morin;H. Fink
我们已经将Cs原子蒸发到作为电子点源的超尖W场发射器尖端上。已观察到与个别原子吸附事件相关的显着电流增加，而在场发射模式中使用这些提示。这表明只有少数原子参与发射过程。用几十个Cs原子装饰尖端顶点导致发射电压仅为纯W发射体所需电压的四分之一。与纯W点源尖端相比，发射电子的能量分布的扩展减小了3倍。因此，我们设计了一个相当单色的电子源，其半峰全宽能量扩展为100 meV。
We have evaporated Cs atoms onto ultrasharp W field emitter tips that act as point sources for electrons. Significant current increases associated with individual atomic adsorption events have been observed while using these tips in the field emission mode. This indicates that only a small number of atoms is involved in the emission process. The decoration of the tip apex with several tens of Cs atoms leads to an emission voltage of only one‐fourth of that required for the pure W emitter. The spread of the energy distribution of the emitted electrons is reduced by a factor of 3 compared to the pure W point‐source tip. Thus we have devised a fairly monochromatic electron source with a full width at half‐maximum energy spread of 100 meV.