A5084230654- Advanced X-ray Imaging Techniques
- Laser-Matter Interactions and Applications
- Particle Accelerators and Free-Electron Lasers
- Spectroscopy and Quantum Chemical Studies
- Advanced Chemical Physics Studies
- Photochemistry and Electron Transfer Studies
- Atomic and Molecular Physics
- Particle Detector Development and Performance
- Mass Spectrometry Techniques and Applications
- Advanced Electron Microscopy Techniques and Applications
- Nuclear Physics and Applications
- Laser-Plasma Interactions and Diagnostics
- Advanced Fluorescence Microscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
Deutsches Elektronen-Synchrotron DESY
2021-2024
Universität Hamburg
2019-2022
Here, we use x-rays to create and probe quantum coherence in the photoionized amino acid glycine. The outgoing photoelectron leaves behind cation a coherent superposition of mechanical eigenstates. Delayed x-ray pulses track induced through resonant absorption that induces Auger decay by emission from sequential double photoionization. Sinusoidal temporal modulation detected signal at early times (0 25 fs) is observed both measurements. Advanced ab initio many-electron simulations allow us...
PETRA III at DESY is one of the brightest synchrotron radiation sources worldwide. It serves a broad international multidisciplinary user community from academia to industry currently 25 specialised beamlines. With storage-ring energy 6 GeV, it provides mainly hard high-energy X-rays for versatile experiments in very range scientific fields. ideally suited an upgrade ultra-low emittance source IV, owing its large circumference 2304 m. targeted storage ring 20×5pm2rad2, IV will reach spectral...
Abstract Wave packet interferometry provides benchmark information on light-induced electronic quantum states by monitoring their relative amplitudes and phases during coherent excitation, propagation, decay. The phase control of soft x-ray pulse replicas the single-digit attosecond timescale achieved in our experiments makes this method a powerful tool to probe ultrafast phenomena such as excitation Auger shake-up with sub-cycle precision. In contribution we present first results obtained...
The F 1s core level photoionization of the ionic molecular radical HF+ has been studied using photon–ion merged-beams technique at a synchrotron radiation source. Upon analyzing kinetic energy release (KER) dependent photoion yield spectra, complex ultrafast dissociation dynamics hole excited σ* state can be revealed. By means configuration–interaction electronic structure calculations potential curves, this process attributed to spin-dependent biradical state.
The successful realization of high gain free-electron lasers has opened new possibilities to X-ray scientists for investigating matter in different states. availability unprecedented photon properties stimulated the development experimental techniques capable taking full advantage these options and started a virtuous collaboration between machine experts users improve further optimize generated pulses. Over recent years, this led several advanced laser (FEL) schemes tailor specific demands....
We present studies on intra-molecular charge redistribution in iodine containing molecules upon iodine-4d photoionization. For this, we employed an XUV-pump-XUV-probe scheme based time-delayed femtosecond pulses delivered by the free-electron laser at DESY Hamburg (FLASH). The experimental results show delay dependent and molecule-specific state distributions that arise multiple Using example of CH3I CH2I2, compare delay-dependent yields I3+. model involved processes using advanced ab initio...
Abstract Carbon 1s excitation of methane, CH 4 , has been studied in the gas phase using ion trap integrated with photon–ion instrument at PETRA III/DESY and soft X-rays from beamline P04. The created photoions are stored within so that further steps can undergo reactions neutral methane molecules. ionic photoproducts as well reaction products thereby mass-over-charge analyzed by an time-of-flight spectrometer. Besides photoions, product ions up to three carbon atoms found. In contrast...
The dependency on the excitation energy of ultrafast multi-photon ionization xenon by intense, short extreme ultraviolet pulses (XUV) was investigated in vicinity 4$d$ 'giant' resonance using ion time-of-flight spectroscopy. yields high charge states show strong variations with energy. With reference to simulated absorption spectra, we can link photon structures single-electron excitations mainly N-shell and purely sequential absorption.