Forthcoming Events

23.01.2019 - 25.01.2019, DESY-Hamburg and European XFEL, Schenefeld, Germany
09.02.2019 - 13.02.2019, Banff Centre, Alberta, Canada

News

Cluster of Excellence RESOLV extended- our partner in FP-RESOMUS and the biannual Science and Gender Meetings
The FP-RESOMUS Grant Agreement- now signed by the ETH Zürich and the European Commission
Kontext - A radio broadcast with Ursula Keller and Aline Rickli - on leadership positions for women in science (in German)
Nobel Prize in Physics 2018 for groundbreaking inventions: intense ultrafast laser pulses and optical tweezers
Ambizione grant awarded to Elsa Abreu- in Steve Johnson's group
Fabrizio Carbone promoted Associate Professor of Physics- in the EPFL School of Basic Sciences from 1st of August
New scientific highlights- by MUST PIs Ursula Keller, Gebhard Schertler / Jörg Standfuss, Majed Chergui, Peter Hamm
White Paper Photonics Switzerland- presented June 20, 2018 at the Swissmem "Industrietag"
Ursula Keller portrayed in the NZZ -Laserlicht ist das schönste Licht der Welt

First time resolved Pilot Experiment by SwissFEL (30.11.2017)

osa-ph
An important highlight for NCCR MUST was the first Pilot Experiment at the SwissFEL Bernina instrument lead by Henrik Lemke associate PI of MUST. The group picture includes the PSI MUST senior people. The three young scientists in the center have worked hard for this experiment and all three are MUST Postdocs: Cristian Sevtina, Giulia Mancini, Roman Mankowsky.

On the 30th of November 2017 SwissFEL saw its first time resolved pilot experiment in the Bernina experimental station of the SwissFEL ARAMIS beamline. A team of scientists from the University of Rennes, ESRF and PSI, led by Marco Cammarata (Univ. Rennes) and Henrik Lemke (PSI), successfully started the experimental phase at SwissFEL. The goal was to study the picosecond dynamics of a light-induced phase transition from a semiconductor to metallic crystal structure in a Titanium Oxide (D). In nanoparticles, the transition occurs reversibly and may be interesting for data storage applications. The transition was studied by powder X-ray diffraction using the 3rd Harmonic 6.6 KeV Photons (~$1%i4 ob'f z0fud/nde,ami2end9taq6l l1@ s)2.x12 a0Kez'V c822n70 aμJ) of SwissFEL (A: Diffraction image, 100 pulse average ). After excitation with infrared laser light (800nm, 42 mJ/cm2), changes in the Debye-Scherrer diffraction rings indicate the transient population changes in the different phases (B). A cascade of dynamic processes from few picosecond acoustic lattice deformation to phase transition from ~10 picosecond to microsecond timescale could be observed (B/C). Once fully analyzed the scientists hope to fully describe the time scale and mechanisms of the photo transformation.

The SwissFEL Bernina experimental station headed by Gerhard Ingold and Henrik Lemke is designed for femtosecond pump-probe experiments in condensed matter and material science, employing photon-in photon-out techniques in the energy range 4 – 12.4 keV. It includes a femtosecond optical laser system to generate a variety of pump beams (from the UV up to the THz range), an X-ray optical scheme to tailor the X-ray probe beam, shot-to-shot diagnostics to monitor the X-ray intensity and arrival time, as well as two endstations operated at a single focus position with spot size of 2-200 μm. The general purpose endstation was used for the first pilot experiment.

This work was performed in the frame of the CNRS IM-LED LIA, in collaboration with prof. Shin-ichi Ohkoshi & Hiroko Tokoro (Tokyo University) who kindly provided samples.


Download (73 KB)
NCCR MUST Office : ETHZ IQE/ULP-HPT H3 | Auguste-Piccard-Hof 1 | 8093 Zurich | E-Mail | +41 44 633 36 02
The National Centres of Competence in Research (NCCR) are a research instrument of the Swiss National Science Foundation
FNSNF