A5044972538- Advanced X-ray Imaging Techniques
- Particle Accelerators and Free-Electron Lasers
- Laser-Plasma Interactions and Diagnostics
- Laser-Matter Interactions and Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Magnetic properties of thin films
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Terahertz technology and applications
- Magnetic and transport properties of perovskites and related materials
- Advanced Electron Microscopy Techniques and Applications
- Nanocluster Synthesis and Applications
- Optical Polarization and Ellipsometry
- Laser-induced spectroscopy and plasma
- Chalcogenide Semiconductor Thin Films
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Force Microscopy Techniques and Applications
- Mass Spectrometry Techniques and Applications
- Molecular Junctions and Nanostructures
- Particle accelerators and beam dynamics
- Enzyme Structure and Function
- Crystallography and Radiation Phenomena
- Magnetic Properties of Alloys
European X-Ray Free-Electron Laser
2023-2024
Deutsches Elektronen-Synchrotron DESY
2019-2024
Hamburg Institut (Germany)
2019
Max Planck Institute for the Structure and Dynamics of Matter
2019
Hamburg Centre for Ultrafast Imaging
2019
Abstract We use intense femtosecond extreme ultraviolet (XUV) pulses with a photon energy of 92 eV from the FLASH free electron laser to irradiate substrate-free CsCl nanoparticles surrounded by He gas number density around 10 15 cm −3 . By simultaneously detecting electrons and energetic ions laser-irradiated micron-size target we study acceleration mechanism light at microplasma-vacuum boundary as well layer close nanoparticle surface. When XUV pulse interacts alone, helium are accelerated...
New synthetic hybrid materials and their increasing complexity have placed growing demands on crystal growth for single-crystal X-ray diffraction analysis. Unfortunately, not all chemical systems are conducive to the isolation of single crystals traditional characterization. Here, small-molecule serial femtosecond crystallography (smSFX) at atomic resolution (0.833 Å) is employed characterize microcrystalline silver n-alkanethiolates with various alkyl chain lengths free electron laser...
Abstract Ultra-short extreme ultraviolet pulses from the free-electron laser FLASH are characterized using terahertz-field driven streaking. Measurements at different ultra-short wavelengths and pulse durations as well numerical simulations were performed to explore application range accuracy of method. For simulation streaking, a standard classical approach is used which compared quantum mechanical theory, based on strong field approximation. Various factors limiting temporal resolution...
The Femtosecond X-ray Experiments (FXE) instrument at the European Free-Electron Laser (EuXFEL) provides an optimized platform for investigations of ultrafast physical, chemical and biological processes. It operates in energy range 4.7-20 keV accommodating flexible versatile environments a wide samples using diverse spectroscopic, scattering diffraction techniques. FXE is particularly suitable experiments taking advantage sub-MHz repetition rates provided by EuXFEL. In this paper dedicated...
The European XFEL is a megahertz repetition-rate facility producing extremely bright and coherent pulses of few tens femtoseconds duration. amount data generated in the context user experiments can exceed hundreds gigabits per second, resulting petabytes stored every year. These rates volumes pose significant challenges both for facilities users thereof. In fact, if unaddressed, extraction interpretation scientific content will be hindered, investment operational costs quickly become...
Self-amplified spontaneous emission (SASE) pulses delivered by free electron lasers (FELs) are inherently fluctuating sources; each pulse varies in energy, duration, arrival time and spectral shape. Therefore, there is strong demand for a full characterization of the properties SASE radiation, which will facilitate more precise interpretation experimental data taken at FELs. In this paper, we present an investigation into fluctuations distribution, energy XUV FLASH, both on shot-to-shot...
A beamline for temporal diagnostics of extreme ultraviolet (XUV) femtosecond pulses at the free-electron laser in Hamburg (FLASH) DESY was designed, built and put into operation. The intense ultra-short XUV FLASH fluctuate from pulse to due underlying FEL operating principle demand single-shot diagnostics. To cope with this, new is equipped a terahertz field-driven streaking setup that enables determination single duration arrival time. parameters diagnostic as well some first experimental...
Instruments based on the magneto-optical Kerr effect are routinely used to probe surface magnetic properties. These tools rely characterization of polarization state reflected light from sample collect information its magnetization. Here, we present a theoretical optimization common setups effect. A detection scheme simple analyzer and photodetector one made polarizing beam splitter balanced photodetectors considered. The including photoelastic modulator (PEM) lock-in amplifier detect signal...
The THz-field-driven streak camera has proven to be a powerful diagnostic-technique that enables the shot-to-shot characterization of duration and arrival time jitter free electron laser (FEL) pulses. Here we investigate performance three computational approaches capable determine FEL pulses with complex temporal structures from single-shot measurements up simultaneously recorded spectra. We use numerically simulated in order validate accuracy pulse length retrieval average as well mode....
Abstract X‐ray free electron laser (XFEL) microcrystallography and synchrotron single‐crystal crystallography are used to evaluate the role of organic substituent position on optoelectronic properties metal–organic chalcogenolates (MOChas). MOChas crystalline 1D 2D semiconducting hybrid materials that have varying depending composition, topology, structure. While attracted much interest, small crystal sizes impede routine structure determination. A series constitutional isomers where aryl...
Free-electron lasers (FELs) operating in the extreme ultraviolet (XUV) and X-ray regions deliver ultrashort pulses with unprecedented intensity, enabling groundbreaking research across various scientific disciplines. A potential chirp (frequency change within pulse) of these influences their spectral properties, directly impacting experimental outcomes FEL performance. The accurate characterization is, therefore, important for optimizing operation interpreting results. This study presents a...
FLASH is the first soft X-ray FEL user facility, routinely providing brilliant photon beams for users since 2005. The second undulator branch of this FLASH2, gap-tunable, which allows testing and using advanced lasing concepts. In particular, we developed a two-color operation mode based on alternatingly tuned segments (every other segment to wavelength). This scheme advantageous in comparison with subsequent generation two colors consecutive sections line. First, source positions are close...
The ultrafast electronic decay of HCl molecules in the time domain after resonant core excitation was measured. Here, a Cl-2p electron promoted to antibonding σ* orbital initiating molecular dissociation, and simultaneously, relaxes via an Auger decay. For HCl, both processes compete on similar ultrashort femtosecond scales. In order measure lifetime hole excitation, we collinearly superimposed 40 fs soft x-ray pulses with intense terahertz (THz) radiation from free-electron laser Hamburg...
Abstract Auger electron spectra were simulated in the presence of a terahertz streaking field to study post-collision interaction (PCI) effects time-evolution photoinduced decays. The PCI is characterized by ratio spectral line width for emission opposite directions with respect THz-field. These calculations have been performed using analytical semiclassical model developed Bauch and Bonitz (2012 Physical Review A 85 053416). results are shown Ne(KLL), Ar(LMM), Kr(MNN) Xe(NOO) transitions...
Self-amplified spontaneous-emission (SASE) free-electron lasers (FELs) deliver ultrashort pulses with femtosecond durations. Due to the fluctuating nature of radiation properties SASE FELs, characterizing FEL on a single-shot basis is necessary. Therefore, we use terahertz streaking characterize temporal extreme ultraviolet from laser in Hamburg (FLASH). In this study, pulse duration as well energy are measured wavelength range 8 34 nm functions undulators contributing lasing process. The...
The effects of postcollision interaction (PCI) in the time evolution photoinduced Auger decay, assisted by a terahertz (THz) field, is theoretically investigated. We propose time-dependent model which based on quantum-mechanical description process and quasiclassical PCI. suggested used for calculating PCI distortion spectrum at different temporal overlaps exciting extreme ultraviolet pulse streaking THz pulse.