A double toroidal analyzer for scanning probe electron energy spectrometer
A double toroidal analyzer for scanning probe electron energy spectrometer
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DOI：
10.1088/1674-1056/23/7/073402
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发表时间：
2014-05
影响因子：
1.7
通讯作者：
Chunkai Xu;Panke Zhang;Meng Li;Xiangjun Chen
中科院分区：
文献类型：
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作者：
Chunkai Xu;Panke Zhang;Meng Li;Xiangjun Chen
研制了一台采用双环形分析器的超高真空兼容电子谱仪。它被设计为与定制的扫描隧道显微镜（STM）相结合，以研究表面上的空间局域电子能谱。采用由压电驱动场发射钨针尖和高度有序热解石墨（HOPG）样品组成的针尖-样品系统对谱仪的性能进行了测试。获得了HOPG表面背散射的能量分辨和角色散电子的二维图像，优化了性能，并对谱仪进行了标定。一个完整的电子能量损失谱，涵盖弹性峰的二次电子峰的HOPG表面，在-140 V的尖端电压和0.5 pA的样品电流，获得，展示了光谱仪的可行性。
An ultra-high vacuum (UHV) compatible electron spectrometer employing a double toroidal analyzer has been developed. It is designed to be combined with a custom-made scanning tunneling microscope (STM) to study the spatially localized electron energy spectrum on a surface. A tip—sample system composed of a piezo-driven field-emission tungsten tip and a sample of highly ordered pyrolytic graphite (HOPG) is employed to test the performance of the spectrometer. Two-dimensional images of the energy-resolved and angle-dispersed electrons backscattered from the surface of HOPG are obtained, the performance is optimized and the spectrometer is calibrated. A complete electron energy loss spectrum covering the elastic peak to the secondary electron peaks for the HOPG surface, acquired at a tip voltage of −140 V and a sample current of 0.5 pA, is presented, demonstrating the viability of the spectrometer.