A double toroidal analyzer for scanning probe electron energy spectrometer

An ultra-high vacuum （UHV） compatible electron spectrometer employing a double toroidal analyzer has been de- veloped. 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 comp...

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Bibliographic Details
Published in:Chinese physics B 2014-07, Vol.23 (7), p.183-187
Main Authors: Xu, Chun-Kai, Zhang, Pan-Ke, Li, Meng, Chen, Xiang-Jun
Format: Article
Language:English
Subjects:
Analyzers
Electric potential
Electron energy
HOPG
Scanning
Scanning tunneling microscopy
Spectrometers
Tungsten
Viability
分析仪
性能优化
扫描探针
扫描隧道显微镜
环形
电子能谱仪
电子能量损失谱
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Summary:An ultra-high vacuum （UHV） compatible electron spectrometer employing a double toroidal analyzer has been de- veloped. 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.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/23/7/073402