Techniques for the Measurement of Photoemission Energy Distribution Curves by the ac Method
Techniques for the Measurement of Photoemission Energy Distribution Curves by the ac Method
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交流法光电发射能量分布曲线测量技术
DOI：
10.1063/1.1684483
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发表时间：
1970
期刊：
影响因子：
--
通讯作者：
R. Eden
中科院分区：
文献类型：
--
作者：
R. Eden
介绍了一种用交流延迟电位法测量光电发射能量分布曲线的新电路，该电路的噪声性能比以前的电路有很大改善。概述了EDC降噪的一般技术，并比较了不同静电计探测器的期望噪声性能。提出了一种从实验电火花火花测量系统中定量评价电火花火花测量系统噪声性能的方法，并将其应用于新测量系统得到的电火花火花测量系统。该系统得到的能量分布曲线的等效噪声电流有效值低至2 ~ 3×10−15 A。这种低噪声允许测量总直流光电流小于10−13 A的EDC。
A new circuit for measuring photoemission energy distribution curves (EDC's) by the ac retarding potential method is described which offers greatly improved noise performance over earlier circuits. General techniques for EDC noise reduction are outlined and the noise performance expected from different electrometer detectors is compared. A method for quantitatively evaluating the noise performance of an EDC measurement system from an experimental EDC is presented and applied to EDC's obtained with this new measurement system. Equivalent noise currents in energy distribution curves obtained with this system are found to be as low as 2 to 3×10−15 A rms. This low noise allows the measurement of EDC's with total dc photocurrents of less than 10−13 A.