Arrell Christopher A, Ojeda José, Longetti Luca, Crepaldi Alberto, Roth Silvan, Gatti Gianmarco, Clark Andrew, van Mourik Frank, Drabbels Marcel, Grioni Marco, Chergui Majed
Laboratory of Ultrafast Spectroscopy and Lausanne Centre for Ultrafast Science (LACUS) ISIC Station 6 Ecole Polytechnique Fédérale de Lausanne (EPFL) CH-1015 Lausanne;, Email:
Laboratory of Ultrafast Spectroscopy and Lausanne Centre for Ultrafast Science (LACUS) ISIC Station 6 Ecole Polytechnique Fédérale de Lausanne (EPFL) CH-1015 Lausanne.
Chimia (Aarau). 2017 May 31;71(5):268-272. doi: 10.2533/chimia.2017.268.
Harmonium is a vacuum ultraviolet (VUV) photon source built within the Lausanne Centre for Ultrafast Science (LACUS). Utilising high harmonic generation, photons from 20-110 eV are available to conduct steady-state or ultrafast photoelectron and photoion spectroscopies (PES and PIS). A pulse preserving monochromator provides either high energy resolution (70 meV) or high temporal resolution (40 fs). Three endstations have been commissioned for: a) PES of liquids; b) angular resolved PES (ARPES) of solids and; c) coincidence PES and PIS of gas phase molecules or clusters. The source has several key advantages: high repetition rate (up to 15 kHz) and high photon flux (1011 photons per second at 38 eV). The capabilities of the facility complement the Swiss ultrafast and X-ray community (SwissFEL, SLS, NCCR MUST, etc.) helping to maintain Switzerland's leading role in ultrafast science in the world.
谐波发生器是一台在洛桑超快科学中心（LACUS）内构建的真空紫外（VUV）光子源。利用高次谐波产生，可获得能量范围为20 - 110电子伏特的光子，用于进行稳态或超快光电子能谱和光离子能谱（PES和PIS）研究。一台脉冲保持单色仪可提供高能量分辨率（70毫电子伏特）或高时间分辨率（40飞秒）。已启用三个终端站，分别用于：a）液体的光电子能谱；b）固体的角分辨光电子能谱（ARPES）；c）气相分子或团簇的符合光电子能谱和光离子能谱。该光源具有几个关键优势：高重复率（高达15千赫兹）和高光子通量（在38电子伏特时为每秒10^11个光子）。该设施的能力补充了瑞士超快和X射线领域（瑞士自由电子激光、瑞士光源、国家研究中心MUST等），有助于瑞士在世界超快科学领域保持领先地位。
