Time of flight spectrometer for background-free positron annihilation induced Auger electron spectroscopy
Time of flight spectrometer for background-free positron annihilation induced Auger electron spectroscopy
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DOI：
10.1063/1.4943858
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发表时间：
2016-03-01
影响因子：
1.6
通讯作者：
Weiss, A. H.
中科院分区：
文献类型：
--
作者：
Mukherjee, S.;Shastry, K.;Weiss, A. H.
我们描述了一种利用飞行时间光谱仪设计的用于正电子湮没诱导俄歇电子能谱的新型光谱仪。光谱仪的新配置使我们能够将动能低至1.5 eV的单能正电子注入到样品上，同时允许检测从样品表面发射的动能从类似于500 eV到0 eV的电子。该光谱仪的独特特性使其有可能进行：(A)演示正电子从非束缚散射态到束缚表面态的直接跃迁的第一次实验，以及(B)第一次实验证明可以获得低至0 eV的俄歇电子谱，而不需要束流诱导的二次电子背景来遮挡谱的低能部分。给出的数据显示了估算正电子表面态结合能和无背景俄歇能的替代方法。(C)2016 AIP出版有限责任公司。
We describe a novel spectrometer designed for positron annihilation induced Auger electron spectroscopy employing a time-of-flight spectrometer. The spectrometer's new configuration enables us to implant monoenergetic positrons with kinetic energies as low as 1.5 eV on the sample while simultaneously allowing for the detection of electrons emitted from the sample surface at kinetic energies ranging from similar to 500 eV to 0 eV. The spectrometer's unique characteristics made it possible to perform (a) first experiments demonstrating the direct transition of a positron from an unbound scattering state to a bound surface state and (b) the first experiments demonstrating that Auger electron spectra can be obtained down to 0 eV without the beam induced secondary electron background obscuring the low energy part of the spectra. Data are presented which show alternative means of estimating positron surface state binding energy and background-free Auger spectra. (C) 2016 AIP Publishing LLC.