A5047364797- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- Quantum, superfluid, helium dynamics
- Crystallography and Radiation Phenomena
- Atomic and Subatomic Physics Research
- Laser-Matter Interactions and Applications
- Heat Transfer and Boiling Studies
- Physics of Superconductivity and Magnetism
- Digital Holography and Microscopy
- Laser-Plasma Interactions and Diagnostics
- Fluid Dynamics and Heat Transfer
- Lattice Boltzmann Simulation Studies
- Spectroscopy and Quantum Chemical Studies
ETH Zurich
2022-2023
Technische Universität Berlin
2018-2023
Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy
2022-2023
Droplets and droplet beams produced from the breakup of micrometer-sized liquid helium jets in vacuum were studied this work, advancing into previously unexplored regimes low stagnation pressures. Using a 5 μm orifice, beam shows surprisingly diverse characteristics at increasing nozzle pressures 0.6 to 100 bar: well-collimated pressures, spray some intermediate values, less-collimated high Focusing on bar 2.7 K, we highlight spectrum jet disturbances, resulting different behaviors. On...
Superfluid helium nanodroplets are an ideal environment for the formation of metastable, self-organized dopant nanostructures. However, presence vortices often hinders their formation. Here, we demonstrate generation vortex-free and explore size range in which they can be produced. From x-ray diffraction images xenon-doped droplets, identify that single compact structures, assigned to aggregation, prevail up 10^{8} atoms per droplet. This finding builds basis exploring assembly...
Extreme ultraviolet (XUV) and X-ray free-electron lasers enable new scientific opportunities. Their ultra-intense coherent femtosecond pulses give unprecedented access to the structure of undepositable nanoscale objects transient states highly excited matter. In order probe ultrafast complex light-induced dynamics on relevant time scales, multi-purpose end-station CAMP at laser FLASH has been complemented by novel multilayer-mirror-based split-and-delay unit DESC (DElay Stage for CAMP)...
Abstract Because of their high photon flux, x-ray free-electron lasers (FEL) allow to resolve the structure individual nanoparticles via coherent diffractive imaging (CDI) within a single pulse. Since inevitable rapid destruction sample limits achievable resolution, thorough understanding spatiotemporal evolution matter on nanoscale following irradiation is crucial. We present technique track induced structural changes in time and space by recording two consecutive diffraction patterns same...
Coherent Diffraction Imaging (CDI) is an experimental technique to get images of isolated structures by recording the light scattered off sample. Thanks extremely bright and short coherent pulses provided X-ray Free Electron Lasers, CDI makes it possible study nanostructures in gas phase time-resolved snapshots their ultrafast dynamics with unprecedented resolution. In principle, sample density can be recovered from field through a straightforward Fourier Transform operation. However, only...
Superfluid helium nanodroplets are an ideal environment for the formation of metastable, self-organized dopant nanostructures. However, presence vortices often hinders their formation. Here, we demonstrate generation vortex-free and explore size range in which they can be produced. From x-ray diffraction images xenon-doped droplets, identify that single compact structures, assigned to aggregation, prevail up $10^8$ atoms per droplet. This finding builds basis exploring assembly...
The excitation of atomic clusters and nanodroplets in strong laser fields is an ideal model scenario for studying the ultrafast physical processes underlying formation evolution highly excited matter. Particularly insightful experiments with high temporal spatial resolution have recently become possible: Via single-particle coherent diffractive imaging (CDI) using intense femtosecond pulses X-ray free-electron lasers (X-FELs), a single, isolated cluster can be "snapshot"-imaged free flight...