Coherent diffractive imaging at synchrotrons and XFEL & Ultrafast non-thermal melting of ice using an XFEL pulse
- Date: 4 February 2022, 13:15–14:00
- Location: https://uu-se.zoom.us/j/65273074687
- Type: Seminar
- Lecturer: Filipe Maia, Cell and Molecular Biology and Carl Caleman, Chemical and Bio-molecular Physics at Uppsala University
- Organiser: Olle Björneholm
The Center for Photon Science at Uppsala University invites you to a seminar series on some scientific opportunities with X-rays presented by Filipe Maia and Carl Caleman from Uppsala University
Filipe Maia, Cell and Molecular Biology: Coherent diffractive imaging at synchrotrons and XFEL
The advent of very coherent X-ray sources, in the form of diffraction limited storage rings and X-ray free-electron lasers (XFELs) has opened new possibilities to coherent diffractive imaging. In this talk I will talk about what is possible using coherent diffractive imaging, and in particular focus on ptychography at synchrotrons and single-particle flash X-ray imaging at XFELs.
Carl Caleman, Chemical and Bio-molecular Physics, UU: Ultrafast non-thermal melting of ice using an XFEL pulse
The bright ultrafast pulses of X-ray Free-Electron Lasers allow investigation into the structure of matter under extreme conditions. We have reported experimental study using single pulses to ionize and probe water as it undergoes a phase transition from liquid to plasma. We report changes in the structure of liquid water on a femtosecond time scale when irradiated by single 6.86 keV X-ray pulses of more than 106 J/cm2. These observations are supported by simulations based on molecular dynamics and plasma dynamics of a water system that is rapidly ionized and driven out of equilibrium. Here I will present new simulations results on a crystalline sample, ice, showing that the crystal order is maintained up to 40 fs after the sample is pushed into the plasma phase. This exotic state of matter, a crystalline plasma, has not been described in this context before.
