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[PUBDB-2019-01970] Journal Article
et al
Direct imaging of orbitals in quantum materials
Nature physics 15, 559 – 562 () [10.1038/s41567-019-0471-2]  GO
The electronic states of quantum materials based on transition-metal, rare-earth and actinide elements are dominated by electrons in the d and f orbitals intertwined with the strong band formation of the solid. Until now, to estimate which specific orbitals contribute to the ground state and thereby determine their physical properties we have had to rely on theoretical calculations combined with spectroscopy. [...]
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Embargoed OpenAccess [PUBDB-2019-01710] Journal Article
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Spin waves and spin-state transitions in a ruthenate high-temperature antiferromagnet
Nature materials 18, 563 – 567 () [10.1038/s41563-019-0327-2]  GO
Ruthenium compounds serve as a platform for fundamental concepts such as spin-triplet superconductivity$^1$, Kitaev spin liquids$^{2,3,4,5}$ and solid-state analogues of the Higgs mode in particle physics$^{6,7}$. However, basic questions about the electronic structure of ruthenates remain unanswered, because several key parameters (including Hund’s coupling, spin–orbit coupling and exchange interactions) are comparable in magnitude and their interplay is poorly understood, partly due to difficulties in synthesizing large single crystals for spectroscopic experiments. [...]
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[PUBDB-2017-04151] Journal Article
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Femtosecond response of polyatomic molecules to ultra-intense hard X-rays
Nature <London> 546(7656), 129 - 132 () [10.1038/nature22373]  GO
X-ray free-electron lasers enable the investigation of the structure and dynamics of diverse systems, including atoms, molecules, nanocrystals and single bioparticles, under extreme conditions1, 2, 3, 4, 5, 6, 7. Many imaging applications that target biological systems and complex materials use hard X-ray pulses with extremely high peak intensities (exceeding 1020 watts per square centimetre)3, 5. [...]
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OpenAccess [PUBDB-2017-01661] Journal Article
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Jitter-correction for IR/UV-XUV pump-probe experiments at the FLASH free-electron laser
In pump-probe experiments employing a free-electron laser (FEL) in combination with a synchronized optical femtosecond laser, the arrival-time jitter between the FEL pulse and the optical laser pulse often severely limits the temporal resolution that can be achieved. Here, we present a pump-probe experiment on the UV-induced dissociation of 2,6-difluoroiodobenzene $(C_{6}H_{3}F_{2}I)$ molecules performed at the FLASH FEL that takes advantage of recent upgrades of the FLASH timing and synchronization system to obtain high-quality data that are not limited by the FEL arrival-time jitter. [...]
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OpenAccess [PUBDB-2017-00274] Journal Article
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Identification of absolute geometries of cis and trans molecular isomers by Coulomb Explosion Imaging
An experimental route to identify and separate geometric isomers by means of coincident Coulomb explosion imaging is presented, allowing isomer-resolved photoionization studies on isomerically mixed samples. We demonstrate the technique on cis/trans 1,2-dibromoethene (C$_2$H$_2$Br$_2$). [...]
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OpenAccess [PUBDB-2015-01454] Journal Article
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Indications of Radiation Damage in Ferredoxin Microcrystals using High-Intensity X-FEL Beams
Proteins that contain metal cofactors are expected to be highly radiation sensitive since the degree of X-ray absorption correlates with the presence of high-atomic-number elements and X-ray energy. To explore the effects of local damage in serial femtosecond crystallography (SFX), Clostridium ferredoxin was used as a model system. [...]
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OpenAccess [PUBDB-2015-01134] Journal Article
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Imaging Molecular Structure through Femtosecond Photoelectron Diffraction on Aligned and Oriented Gas-Phase Molecules
Faraday discussions 171, 57 - 80 () [10.1039/C4FD00037D]  GO
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[PUBDB-2014-03698] Dissertation / PhD Thesis

Imaging Molecular Structure with Photoelectron Diffraction
Heidelberg University, Diss., 2014
The possibility to study the structure of polyatomic gas-phase molecules by photoelectron diffraction is investigated with the goal of developing a method capable of imaging ultrafast photochemical reactions with femtosecond temporal and sub-Ångström spatial resolution. The fluorine 1s-level of adiabatically laser-aligned 1-ethynyl-4-fluorobenzene (C8H5F) molecules was ionized by X-ray pulses from the Linac Coherent Light Source Free-Electron Laser, and the angular distributions of photoelectrons with kinetic energies between 30 and 60 eV were recorded by velocity map imaging. [...]
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OpenAccess [PUBDB-2014-03678] Journal Article
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Electron Rearrangement Dynamics in Dissociating $\mathrm{I^n_2{^+}}$ Molecules Accessed by Extreme Ultraviolet Pump-Probe Experiments
The charge rearrangement in dissociating In+2 molecules is measured as a function of the internuclear distance R using extreme ultraviolet pulses delivered by the free-electron laser in Hamburg. Within an extreme ultraviolet pump-probe scheme, the first pulse initiates dissociation by multiply ionizing I2, and the delayed probe pulse further ionizes one of the two fragments at a given time, thus triggering charge rearrangement at a well-defined R. [...]
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[DESY-2014-02115] Journal Article

Chemische Reaktionen in Superzeitlupe
Einen neuen Weg in die Femtochemie eröffnen die intensiven Femtosekunden-Lichtpulse im extremen Ultraviolett (EUV) aus dem Freie-Elektronen-Laser in Hamburg (FLASH) zusammen mit einer ausgefeilten Pump-Probe-Apparatur. Damit konnte erstmals die lichtinduzierte Umwandlung eines Acetylenmoleküls in sein Isomer Vinyliden in drei Dimensionen als “Zeitlupenfilm” visualisiert werden. [...]
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