A new technique for threshold excitation spectroscopy
A new technique for threshold excitation spectroscopy
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阈值激发光谱新技术
DOI：
10.1088/0022-3700/7/10/013
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发表时间：
1974
期刊：
影响因子：
--
通讯作者：
F. H. Read
中科院分区：
文献类型：
--
作者：
S. Cvejanović;F. H. Read
开发了一种新技术，用于在电子-原子和电子-分子碰撞中获得高分辨率阈值激发光谱。穿透靶室的非常弱的场在电势分布中产生鞍点，其具有聚焦和提高非常低能量非弹性散射电子的提取效率的效果。电子能量分析仪还以特殊模式使用，该模式可锐化低能电子的通带。给出了He、Ar和N2的阈值激发光谱的例子，并且利用氦的23S和21S态的起始点来精确确定氦中22S共振的能量（19.361+或-0.009 eV）。
A new technique has been developed for obtaining high resolution threshold excitation spectra in electron-atom and electron-molecule collisions. A very weak field penetrating into the target chamber produces a saddle point in the potential distribution which has the effect of focusing and enhancing the extraction efficiency of very low energy inelastically scattered electrons. Also the electron energy analyser is used in a special mode which sharpens the pass band for low energy electrons. Examples of threshold excitation spectra of He, Ar and N2 are given, and the onsets of the 23S and 21S states of helium have been used to determine accurately the energy (19.361+or-0.009 eV) of the 22S resonance in helium.