Ursula Keller wins “Swiss Nobel” Marcel Benoist Prize- for pioneering work in ultrafast lasers
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
NCCR MUST at Scientifica 2021- Lightning, organic solar cells, and virtual molecules

Following Femtosecond Dynamics in Liquids with a High Harmonic Generation Source in the Water Window Regime

February 19, 2020

Femtosecond Soft-X-ray Absorption Spectroscopy of Liquids with a Water-Window High-Harmonic Source

It is a long-standing quest in science to follow reactions of chemical and biological systems in their natural liquid environment in real time. We demonstrate femtosecond time–resolved soft–X–ray absorption spectroscopy for measurement of valence ionization dynamics of simple organic molecules of ethanol and methanol. Liquid-phase transient-absorption measurements in soft X-ray spectral range rely on a combination of a sub–micrometer–thin flat liquid jet with a high–harmonic table–top source covering the entire water-window range (284 - 538 eV). In a pump-probe scheme, intense 400 nm pump pulses were utilized to kick-off the dynamics via strong-field ionization of the liquid samples and delayed broadband soft X-ray pulse from a water window high harmonic generation source probed the electronic structure with around 30 fs time resolution. We observe differences in rise-time of the induced transient changes in X-ray absorption in methanol and ethanol indicating ultrafast proton dynamics after ionization in those systems. This work enables obtaining a detailed insight on liquid-phase dynamics using the element and site sensitivity of X-ray spectroscopy.

Reference: Smith, Adam D., Balciunas, Tadas,  Chang, Yi-Ping,  Schmidt, Cedric., Zinchenko, Kristina, Nunes, Fernanda B.,  Rossi, Emanuele,  Svoboda, Vít, Yin, Zhong, Wolf, Jean-Pierre, Wörner, Hans Jakob, Journal of Physical Chemistry Letters, 2020, vol. 11, n° 6, p. 1981-1988, (doi: 10.1021/acs.jpclett.9b03559)

NCCR MUST Office : ETHZ IQE/ULP-HPT H3 | Auguste-Piccard-Hof 1 | 8093 Zurich | E-Mail
The National Centres of Competence in Research (NCCR) are a research instrument of the Swiss National Science Foundation