Günter Brenner
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View article: Wavelength-dependent photodissociation of iodomethylbutane
Wavelength-dependent photodissociation of iodomethylbutane Open
Ultrashort XUV pulses of the Free-Electron-LASer in Hamburg (FLASH) were used to investigate laser-induced fragmentation patterns of the prototypical chiral molecule 1-iodo-2-methyl-butane ( $$\hbox {C}_5$$ $$\hbox {H}_{11}$$ I) in a pump-…
View article: First experiments with ultrashort, circularly polarized soft x-ray pulses at FLASH2
First experiments with ultrashort, circularly polarized soft x-ray pulses at FLASH2 Open
Time-resolved absorption spectroscopy and magnetic circular dichroism with circularly polarized soft x-rays (XAS and XMCD) are powerful tools to probe electronic and magnetic dynamics in magnetic materials element- and site-selectively. By…
View article: Percival soft X-ray CMOS Imager for Photon Science – Status and Prospects
Percival soft X-ray CMOS Imager for Photon Science – Status and Prospects Open
Percival is a CMOS-based imager with 2 megapixels, also called P2M, designed for photon science experiments. The first generation of the P2M sensor showed some performance issues. Specifically, ADCs in full-speed operation mode are affecte…
View article: Simultaneous mapping of the ultrafast time and fluence dependence of the laser-induced insulator-to-metal transition in magnetite
Simultaneous mapping of the ultrafast time and fluence dependence of the laser-induced insulator-to-metal transition in magnetite Open
Pump-probe methods are a ubiquitous tool in the field of ultrafast dynamic measurements. In recent years, x-ray free-electron laser experiments have gained importance due to their ability to probe with high chemical selectivity and at atom…
View article: Femtosecond charge and spin dynamics in a Co50Pt50 alloy
Femtosecond charge and spin dynamics in a Co50Pt50 alloy Open
The use of advanced x-ray sources plays a key role in the study of dynamic processes in magnetically ordered materials. The progress in x-ray free-electron lasers enables the direct and simultaneous observation of the femtosecond evolution…
View article: Wavelength-Dependent Photodissociation of Iodomethylbutane
Wavelength-Dependent Photodissociation of Iodomethylbutane Open
Ultrashort XUV pulses of the Free-Electron-LASer in Hamburg (FLASH) were used to investigate laser-induced fragmentation patterns of the prototypical chiral molecule 1-iodo-2-methyl-butane (C$_5$H$_{11}$I) in a pump-probe scheme. Ion veloc…
View article: First experiments with ultrashort, circularly polarized soft X-ray pulses at FLASH2
First experiments with ultrashort, circularly polarized soft X-ray pulses at FLASH2 Open
Time-resolved absorption spectroscopy as well as magnetic circular dichroism with circularly polarized soft X-rays (XAS and XMCD) are powerful tools to probe electronic and magnetic dynamics in magnetic materials element- and site-selectiv…
View article: Femtosecond charge and spin dynamics in CoPt alloys
Femtosecond charge and spin dynamics in CoPt alloys Open
The use of advanced X-ray sources plays a key role in the study of dynamic processes in magnetically ordered materials. The progress in X-ray free electron lasers enables the direct and simultaneous observation of the femtosecond evolution…
View article: Simultaneous mapping of the ultrafast time and fluence dependence of the laser-induced insulator-to-metal transition in magnetite
Simultaneous mapping of the ultrafast time and fluence dependence of the laser-induced insulator-to-metal transition in magnetite Open
Pump-probe methods are a ubiquitous tool in the field of ultrafast dynamic measurements. In recent years, x-ray free-electron laser experiments have gained importance due to their ability to probe with high chemical selectivity and at atom…
View article: Insights into the laser-assisted photoelectric effect from solid-state surfaces
Insights into the laser-assisted photoelectric effect from solid-state surfaces Open
Photoemission from a solid surface provides a wealth of information about its electronic structure and dynamic evolution. Ultrafast pump-probe experiments offer real-time access to photon-surface interactions and the resulting electron dyn…
View article: Optical control of 4 <i>f</i> orbital state in rare-earth metals
Optical control of 4 <i>f</i> orbital state in rare-earth metals Open
A change of orbital state alters the coupling between ions and their surroundings drastically. Orbital excitations are hence key to understand and control interaction of ions. Rare-earth elements with strong magneto-crystalline anisotropy …
View article: New insights into the laser-assisted photoelectric effect from solid-state surfaces
New insights into the laser-assisted photoelectric effect from solid-state surfaces Open
Photoemission from a solid surface provides a wealth of information about its electronic structure and dynamic evolution. Ultrafast pump-probe experiments offer real-time access to photon-surface interactions and the resulting electron dyn…
View article: Time-Resolved X-ray Photoelectron Spectroscopy: Ultrafast Dynamics in CS<sub>2</sub>Probed at the S 2p Edge
Time-Resolved X-ray Photoelectron Spectroscopy: Ultrafast Dynamics in CS<sub>2</sub>Probed at the S 2p Edge Open
Recent developments in X-ray free-electron lasers have enabled a novel site-selective probe of coupled nuclear and electronic dynamics in photoexcited molecules, time-resolved X-ray photoelectron spectroscopy (TRXPS). We present results fr…
View article: Out-of-equilibrium charge redistribution data in a copper-oxide based superconductor by time-resolved X-ray photoelectron spectroscopy
Out-of-equilibrium charge redistribution data in a copper-oxide based superconductor by time-resolved X-ray photoelectron spectroscopy Open
This dataset was measured using a momentum microscope by time-resolved X-ray photoelectron spectroscopy (XPS) on the prototypical high-temperature superconductor: optimally doped BSCCO at FEL FLASH, DESY in Hamburg. With time-resolved XPS,…
View article: Author Correction: Subpicosecond metamagnetic phase transition in FeRh driven by non-equilibrium electron dynamics
Author Correction: Subpicosecond metamagnetic phase transition in FeRh driven by non-equilibrium electron dynamics Open
International audience
View article: Photon energy-resolved velocity map imaging from spectral domain ghost imaging
Photon energy-resolved velocity map imaging from spectral domain ghost imaging Open
We present an approach that combines photon spectrum correlation analysis with the reconstruction of three-dimensional momentum distribution from velocity map images in an efficient, single-step procedure. We demonstrate its efficacy with …
View article: Photon Energy-Resolved Velocity Map Imaging from Spectral Domain Ghost\n Imaging
Photon Energy-Resolved Velocity Map Imaging from Spectral Domain Ghost\n Imaging Open
We present an approach that combines photon spectrum correlation analysis\nwith the reconstruction of three-dimensional momentum distribution from\nvelocity map images in an efficient, single-step procedure. We demonstrate its\nefficacy wi…
View article: High-intensity laser experiments with highly charged ions in a Penning trap
High-intensity laser experiments with highly charged ions in a Penning trap Open
We have conceived and built the HILITE (High-Intensity Laser-Ion Trap Experiment) Penning-trap setup for the production, confinement and preparation of pure ensembles of highly charged ions in a defined quantum state as a target for variou…
View article: Probing electron and hole colocalization by resonant four-wave mixing spectroscopy in the extreme ultraviolet
Probing electron and hole colocalization by resonant four-wave mixing spectroscopy in the extreme ultraviolet Open
Extending nonlinear spectroscopic techniques into the x-ray domain promises unique insight into photoexcited charge dynamics, which are of fundamental and applied interest. We report on the observation of a third-order nonlinear process in…
View article: Data for: Probing electron and hole co-localization by resonant four-wave mixing spectroscopy in the extreme-ultraviolet
Data for: Probing electron and hole co-localization by resonant four-wave mixing spectroscopy in the extreme-ultraviolet Open
Data for: Probing electron and hole co-localization by resonant four-wave mixing spectroscopy in the extreme-ultraviolet
View article: Ultrafast manipulation of the NiO antiferromagnetic order via sub-gap optical excitation
Ultrafast manipulation of the NiO antiferromagnetic order via sub-gap optical excitation Open
Wide-band-gap insulators such as NiO offer the exciting prospect of coherently manipulating electronic correlations with strong optical fields. Contrary to metals where rapid dephasing of optical excitation via electronic processes occurs,…
View article: Ultrafast manipulation of the NiO antiferromagnetic order <i>via</i> sub-gap optical excitation
Ultrafast manipulation of the NiO antiferromagnetic order <i>via</i> sub-gap optical excitation Open
We present a comprehensive investigation of ultrafast demagnetisation and accompanying band gap reduction in a charge transfer insulator using time-resolved resonant X-ray reflectivity.
View article: XUV-Initiated Dissociation Dynamics of Molecular Oxygen (O<sub>2</sub>)
XUV-Initiated Dissociation Dynamics of Molecular Oxygen (O<sub>2</sub>) Open
We performed a time-resolved spectroscopy experiment on the dissociation of oxygen molecules after the interaction with intense extreme-ultraviolet (XUV) light from the free-electron laser in Hamburg at Deutsches Elektronen-Synchrotron. Us…
View article: All-XUV Pump-Probe Transient Absorption Spectroscopy of the Structural Molecular Dynamics of Di-iodomethane
All-XUV Pump-Probe Transient Absorption Spectroscopy of the Structural Molecular Dynamics of Di-iodomethane Open
In this work, we use an extreme-ultraviolet (XUV) free-electron laser (FEL) to resonantly excite the I: 4d5/2–σ* transition of a gas-phase di-iodomethane (CH2I2) target. This site-specific excitation generates a 4d core hole located at an …
View article: Ultrafast electronic line width broadening in the C 1s core level of graphene
Ultrafast electronic line width broadening in the C 1s core level of graphene Open
Time-, k-, and energy-resolved photoemission data for C 1s in H-intercalated graphene on SiC (QFMLG). Here we use a free electron laser to investigate the effect of a transiently excited hot electron gas on the core level spectrum of graph…
View article: Ultrafast electronic line width broadening in the C 1s core level of graphene
Ultrafast electronic line width broadening in the C 1s core level of graphene Open
Time-, k-, and energy-resolved photoemission data for C 1s in H-intercalated graphene on SiC (QFMLG). Here we use a free electron laser to investigate the effect of a transiently excited hot electron gas on the core level spectrum of graph…