Eur.XFEL

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2017-12-07
17:48
OpenAccess [PUBDB-2017-12919] Journal Article
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Surface, final state, and spin effects in the valence-band photoemission spectra of LaCoO$_{3}$ (001)
ddc:530
The electronic structure of a LaCoO$_{3}$(001) perovskite is analyzed using simulated and measured angle-resolved valence-band photoemission spectroscopy data with emphasis on the effects of the surface truncation, the final state effects, and the spin degeneracy removal. Supercell simulations reveal instability towards the formation of nonuniform spin polarization in the Co-containing layers under tensile stress [...]
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2017-12-01
09:45
[PUBDB-2017-12644] Journal Article
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Non-uniform nanosecond gate-delay of hybrid pixel detectors
ddc:540
A simple experiment to characterize the gating properties of X-ray area detectors using pulsed X-ray sources is presented. For a number of time-resolved experiments the gating uniformity of area detectors is important. [...]
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2017-12-01
09:30
OpenAccess [PUBDB-2017-12642] Journal Article
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High-energy x-ray diffraction from surfaces and nanoparticles
ddc:530
High-energy surface-sensitive x-ray diffraction (HESXRD) is a powerful high-energy photon technique (E>70 keV) that has in recent years proven to allow a fast data acquisition for the 3D structure determination of surfaces and nanoparticles under in situ and operando conditions. The use of a large-area detector facilitates thedirect collection of nearly distortion-free diffraction patterns over a wide q range, including crystal truncation rods perpendicular to the surface and large-area reciprocal space maps from epitaxial nanoparticles, which is not possible in the conventional low-photon energy approach (E=10−20 keV). [...]
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2017-11-28
12:36
OpenAccess [PUBDB-2017-12442] Report/Dissertation / PhD Thesis
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Ultrafast X-ray Spectroscopies of Transition Metal Complexes Relevant for Catalysis
[XFEL.EU THESIS-2017-002]
207 pp. (2017) [10.3204/PUBDB-2017-12442] = Dissertation, University of Hamburg, 2017  GO
Transition metal (TM) complexes are ubiquitous in both technological and biological catalytic systems. For a detailed understanding of their reactivity, a knowledge of the fundamental processes during chemical reactions is crucial. [...]
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2017-11-26
12:49
OpenAccess [PUBDB-2017-12328] Journal Article
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Correlations in Scattered X-Ray Laser Pulses Reveal Nanoscale Structural Features of Viruses
ddc:550
We use extremely bright and ultrashort pulses from an x-ray free-electron laser (XFEL) to measure correlations in x rays scattered from individual bioparticles. This allows us to go beyond the traditional crystallography and single-particle imaging approaches for structure investigations [...]
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2017-11-13
18:29
[PUBDB-2017-11924] Poster
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Ultrafast fragmentation dynamics of Phenanthrene andPyrene after photoionization at 30.3 nm wavelength
DESY Users Meeting 2017, Meeting locationHamburg, Germany, 25 Jan 2017 - 27 Jan 20172017-01-252017-01-27

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2017-11-09
10:29
[PUBDB-2017-11802] Journal Article
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Single-shot nonlinear spectroscopy in the vacuum-ultraviolet
Optica 4(8), 871 - 878 (2017) [10.1364/OPTICA.4.000871]  GO
ddc:530
Time-resolved spectroscopy in the vacuum/extreme ultraviolet (VUV/XUV) spectral range promises to disclose ultrafast dynamics in all states of matter. Completing a measurement within a single shot eliminates the influence of experimental parameter fluctuations and enhances its statistical significance. [...]
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2017-11-09
10:16
Embargoed OpenAccess [PUBDB-2017-11799] Journal Article
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Probing Transient Valence Orbital Changes with Picosecond Valence-to-Core X-ray Emission Spectroscopy
ddc:540
We probe the dynamics of valence electrons in photoexcited [Fe(terpy)$_2$]$^{2+}$ in solution to gain deeper insight into the Fe−ligand bond changes. We use hard X-rayemission spectroscopy (XES), which combines element specificity and high penetration with sensitivity to orbital structure, making it a powerful technique for molecular studies in a wide variety of environments. [...]
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2017-10-24
11:53
OpenAccess [PUBDB-2017-11523] Journal Article
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Analysis of XFEL serial diffraction data from individual crystalline fibrils
IUCrJ 4(6), 795 - 811 (2017) [10.1107/S2052252517014324]  GO
ddc:530
Serial diffraction data collected at the Linac Coherent Light Source from crystalline amyloid fibrils delivered in a liquid jet show that the fibrils are well oriented in the jet. At low fibril concentrations, diffraction patterns are recorded from single fibrils; these patterns are weak and contain only a few reflections [...]
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2017-08-31
16:31
OpenAccess [PUBDB-2017-10204] Journal Article
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Coherent soft X-ray diffraction imaging of coliphage PR772 at the Linac coherent light source
ddc:610
Single-particle diffraction from X-ray Free Electron Lasers offers the potential for molecular structure determination without the need for crystallization. In an effort to further develop the technique, we present a dataset of coherent soft X-ray diffraction images of Coliphage PR772 virus, collected at the Atomic Molecular Optics (AMO) beamline with pnCCD detectors in the LAMP instrument at the Linac Coherent Light Source. [...]
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