News

Ursula Keller wins “Swiss Nobel” Marcel Benoist Prize- for pioneering work in ultrafast lasers

Farewell: the NCCR MUST ended - on June 30, 2022

MUST2022 Conference- a great success!

New scientific highlights- by MUST PIs Wörner, Chergui, and Richardson

FELs of Europe prize for Jeremy Rouxel- “Development or innovative use of advanced instrumentation in the field of FELs”

Ruth Signorell wins Doron prizefor pioneering contributions to the field of fundamental aerosol science

New FAST-Fellow Uwe Thumm at ETH- lectures on Topics in Femto- and Attosecond Science

International Day of Women and Girls in Science- SSPh asked female scientists about their experiences

New scientific highlight- by MUST PIs Milne, Standfuss and Schertler

EU XFEL Young Scientist Award for Camila Bacellar,beamline scientist and group leader of the Alvra endstation at SwissFEL

Prizes for Giulia Mancini and Rebeca Gomez CastilloICO/IUPAP Young Scientist Prize in Optics & Ernst Haber 2021

Nobel Prize in Chemistry awarded to RESOLV Member Benjamin List- for the development of asymmetric organocatalysis

Hans Jakob Wörner invited to give the „New Horizons Solvay Lectures” - online, October 5, 12 and 19

Unusual keynote talk at an international scientific conference- Do photons show gender bias?

NCCR MUST at Scientifica 2021- Lightning, organic solar cells, and virtual molecules

Velocity Map Imaging System

back »»

Location		Contact
ETH Zurich HCI G 228 Wolfgang-Pauli-Strasse 10 8093 Zürich		Samuel Walt Phone: 0041 44 633 49 79 Email: 0swt%alr1t@b8phi+ysh4.cg,hep*m.q.etf#hzt0.cj0hv
Setup / Configuration Angularly-resolved momentum distributions for electrons and ions Kinetic energies from 0-200 eV can be detected 8 cm diameter MCP detector Time-of-flight spectrometer 1 kHz pulsed valve fast electronics for switching MCP gain on/off in <100 ns Combinable with attosecond pump-probe setup		Literature D. W. Chandler and P. L. Houston, The Journal of Chemical Physics 87, 1445 (1987).
Figure 1 shows a cut through the velocity- map imaging system (VMIS). The lower half part consist of an electrostatic lens system and a micro- channel plate detector. The upper part includes the pulsed valve and the skimmer. Each side is pumped by a turbo- molecular pump. A simplified drawing is shown in figure 2.		Fig. 2. The molecules are ionized with an intense femtosecond near-infrared laser pulse in the center between the repeller and extractor plates. A static electric field focuses the photoelectrons on the MCP detector (Fig. 2a). In order to increase the cooling efficiency, a skimmer is placed between the pulsed valve and the repeller. For experiments with extreme-ultraviolet attosecond laser pulses, high gas densities in the interaction region are required. To this end, the skimmer is removed and the valve is moved very close to the repeller (Fig. 2b). Our VMIS thus offers a continuously tunable target density combined with a controlled degree of molecular cooling in the supersonic expansion.
		back »»