TY - JOUR AU - Arrell, Christopher A. AU - Grioni, Marco AU - Drabbels, Marcel AU - van Mourik, Frank AU - Clark, Andrew AU - Gatti, Gianmarco AU - Roth, Silvan AU - Crepaldi, Alberto AU - Longetti, Luca AU - Ojeda, José AU - Chergui, Majed PY - 2017/05/31 Y2 - 2024/03/29 TI - Harmonium: An Ultrafast Vacuum Ultraviolet Facility JF - CHIMIA JA - Chimia VL - 71 IS - 5 SE - Scientific Articles DO - 10.2533/chimia.2017.268 UR - https://www.chimia.ch/chimia/article/view/2017_268 SP - 268 AB - 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. ER -