Eur.XFEL

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2019-05-16
16:20
OpenAccess [PUBDB-2019-02299] Journal Article/Report

Accelerator Beam Dynamics at the European X-Ray Free Electron Laser
[DESY-18-178]
We consider the collective beam dynamics in the accelerator of the European X-ray Free Electron Laser for electron bunches with charges of 250 and 500 pC. The dynamics has been studied numerically with different computer programs, and we struggle to include properly the whole beam physics with collective effects. [...]
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2019-05-08
09:15
OpenAccess [PUBDB-2019-02178] Journal Article
et al
Photon diagnostics at the FLASH THz beamline
The THz beamline at FLASH, DESY, provides both tunable (1–300 THz) narrow-bandwidth (∼10%) and broad-bandwidth intense (up to 150 uJ) THz pulses delivered in 1 MHz bursts and naturally synchronized with free-electron laser X-ray pulses. Combination of these pulses, along with the auxiliary NIR and VIS ultrashort lasers, supports a plethora of dynamic investigations in physics, material science and biology. [...]
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2019-04-02
13:22
OpenAccess [PUBDB-2019-01807] Journal Article
et al
In situ stability of carbonates in presence of mantle phases
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2019-02-13
14:30
OpenAccess [PUBDB-2019-01075] Journal Article
et al
The Adaptive Gain Integrating Pixel Detector at the European XFEL
The Adaptive Gain Integrating Pixel Detector (AGIPD) is an X-ray imager, custom designed for the European X-ray Free-Electron Laser (XFEL). It is a fast, low-noise integrating detector, with an adaptive gain amplifier per pixel. [...]
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2019-02-12
10:13
OpenAccess [PUBDB-2019-01056] Journal Article
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Ultrafast structural dynamics of photo-reactions observed by time-resolved x-ray cross-correlation analysis
Structural dynamics 6(2), 024301 () [10.1063/1.5086374]  GO
We applied angular X-ray Cross-Correlation analysis (XCCA) to scattering images from a femtosecond resolution X-ray free-electron laser pump-probe experiment with solvated PtPOP {[Pt$_2$(P$_2$O$_5$H$_2$)$_4$]$^{4–}$} metal complex molecules. The molecules were pumped with linear polarized laser pulses creating an excited state population with a preferred orientational (alignment) direction [...]
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2019-01-30
15:23
OpenAccess [PUBDB-2019-00875] Journal Article
et al
Roadmap of ultrafast x-ray atomic and molecular physics
X-ray free-electron lasers (XFELs) and table-top sources of x-rays based upon high harmonic generation (HHG) have revolutionized the field of ultrafast x-ray atomic and molecular physics, largely due to an explosive growth in capabilities in the past decade. XFELs now provide unprecedented intensity (1020 W cm−2) of x-rays at wavelengths down to ~1 Ångstrom, and HHG provides unprecedented time resolution (~50 attoseconds) and a correspondingly large coherent bandwidth at longer wavelengths [...]
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2019-01-30
15:18
OpenAccess [PUBDB-2019-00874] Journal Article
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Stimulated X-Ray Emission Spectroscopy in Transition Metal Complexes
We report the observation and analysis of the gain curve of amplified $Kα$ x-ray emission from solutions of Mn(II) and Mn(VII) complexes using an x-ray free electron laser to create the $1s$ core-hole population inversion. We find spectra at amplification levels extending over 4 orders of magnitude until saturation [...]
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2019-01-29
09:28
OpenAccess [PUBDB-2019-00839] Journal Article
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Author Correction: Generation and characterization of ultrathin free-flowing liquid sheets ist
The physics and chemistry of liquid solutions play a central role in science, and our understanding of life on Earth. Unfortunately, key tools for interrogating aqueous systems, such as infrared and soft X-ray spectroscopy, cannot readily be applied because of strong absorption in water. [...]
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2019-01-16
16:27
[PUBDB-2019-00538] Journal Article
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Pressure-induced amorphization in plagioclase feldspars: A time-resolved powder diffraction study during rapid compression
The pressure-induced amorphization of the two endmembers of the plagioclase ((Na$_{1−x}$Cax)Al$_{1+x}$Si$_{3−x}$O$_8$) solid-solution, anorthite (CaAl$_2$Si$_2$O$_8$) and albite (NaAlSi$_3$O$_8$), has been studied as a function of compression rate by means of time-resolved powder diffraction. Anorthite and albite were compressed in a diamond anvil cell to 80 GPa at multiple rates from 0.05 GPa/s to 80 GPa/s. [...]
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2019-01-08
10:17
OpenAccess [PUBDB-2019-00094] Journal Article
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Evidence of a first-order smectic-hexatic transition and its proximity to a tricritical point in smectic films
Experimental and theoretical studies of a smectic-A–hexatic-B transition in freely suspended films of thickness 2 –10 $μm$ of the n-pentyl-4′−n-pentanoyloxy-biphenyl-4-carboxylate (54COOBC) compound are presented. X-ray investigations revealed a discontinuous first-order transition into the hexatic phase [...]
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