Bühlmann K, Gort R, Fognini A, Däster S, Holenstein S, Hartmann N, Zemp Y, Salvatella G, Michlmayr T U, Bähler T, Kutnyakhov D, Medjanik K, Schönhense G, Vaterlaus A, Acremann Y
Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland.
Institute of Physics, Johannes Gutenberg University of Mainz, 55128 Mainz, Germany.
Rev Sci Instrum. 2020 Jun 1;91(6):063001. doi: 10.1063/5.0004861.
We present a compact setup for spin-, time-, and angle-resolved photoemission spectroscopy. A 10 kHz titanium sapphire laser system delivers pulses of 20 fs duration, which drive a high harmonic generation-based source for ultraviolet photons at 21 eV for photoemission. The same laser also excites the sample for pump-probe experiments. Emitted electrons pass through a hemispherical energy analyzer and a spin-filtering element. The latter is based on spin-polarized low-energy electron diffraction on an Au-passivated iridium crystal. The performance of the measurement system is discussed in terms of the resolution and efficiency of the spin filter, which are higher than those for Mott-based techniques.
我们展示了一种用于自旋、时间和角度分辨光电子能谱的紧凑装置。一个10kHz的钛宝石激光系统产生持续时间为20fs的脉冲，该脉冲驱动一个基于高次谐波产生的光源，用于产生21eV的紫外光子以进行光电子发射。同一激光还激发样品用于泵浦-探测实验。发射出的电子穿过一个半球形能量分析器和一个自旋过滤元件。后者基于在金钝化铱晶体上的自旋极化低能电子衍射。根据自旋过滤器的分辨率和效率对测量系统的性能进行了讨论，其分辨率和效率高于基于莫特技术的系统。
