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High-Energy Photoemission at HASYLAB

机译:Hasylab的高能量照片

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摘要

An instrument for high-energy X-ray photoelectron spectroscopy is operated at the BW2 wiggler beamline of HASYLAB. The photon energy ranges from 2.3 to 10 keV, the electron energy reaches up to 7.5 keV (including an optional 2.5 keV sample bias, the current electron analyzer limit is 5 keV). Using a Si(311) double crystal monochromator, the total energy resolution is 0.37 eV at 4.3 keV as determined from the Si 2p photoemission. For Si(111) typical values are 0.45 eV at 3 keV. The photon flux typically amounts to 5×10~(12) 1/s for Si(111). Focusing is achieved by the combination of a sagittally bent monochromator crystal and a tangentially bent mirror in the monochromatic beam. The focus size (FWHM) at the sample is 0.25 mm (vertical) × 2 mm (horizontal) which is well matching the acceptance of the SCIENTA SES-200 electron analyzer. Selected results are shown to demonstrate the instrument performance.
机译:用于高能X射线光电子能谱的仪器在BW2 Wiggler光束线上操作。光子能量范围为2.3至10keV,电子能量达到高达7.5 keV(包括可选的2.5keV样品偏置,电流电子分析仪限制为5keV)。使用Si(311)双晶单色器,从Si 2P PhotoMission确定的4.3keV的总能量分辨率为0.37eV。对于SI(111),典型值为3 keV为0.45eV。光子通量通常为Si(111)的5×10〜(12)1 / s。通过在单色梁中的垂直弯曲单色仪晶体和切向弯曲的镜子的组合来实现聚焦。样品的焦距(FWHM)为0.25毫米(垂直)×2mm(水平),这符合Scienta SES-200电子分析仪的接受良好。显示所选结果显示仪器性能。

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