Eur.XFEL

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2019-07-12
10:44
OpenAccess [PUBDB-2019-02698] Journal Article
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Evidence of Extreme Ultraviolet Superfluorescence in Xenon
We present a comprehensive experimental and theoretical study on superfluorescence in the extreme ultraviolet wavelength regime. Focusing a free-electron laser pulse in a cell filled with Xe gas, the medium is quasi-instantaneously population inverted by 4d-shell ionization on the giant resonance followed by Auger decay [...]
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2019-06-29
11:40
Embargoed OpenAccess [PUBDB-2019-02611] Journal Article
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New dynamic diamond anvil cells for tera-pascal per second fast compression x-ray diffraction experiments
Fast compression experiments performed using dynamic diamond anvil cells (dDACs) employing piezoactuators offer the opportunity to study compression-rate dependent phenomena. In this paper, we describe an experimental setup which allows us to perform time-resolved x-ray diffraction during the fast compression of materials using improved dDACs. [...]
Published on 2019-06-21. Available in OpenAccess from 2020-06-21.: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:620
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2019-06-21
10:30
OpenAccess [PUBDB-2019-02527] Journal Article
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Two-color XUV+NIR femtosecond photoionization of neon in the near-threshold region
Results of angle-resolved electron spectroscopy of near-threshold photoionization of Ne atoms bycombined femtosecond extreme ultraviolet and near infraredfields are presented. The dressed-electron spectra show an energetic distribution into so-called sidebands, being separated by thephoton energy of the dressing laser [...]
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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
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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
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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
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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
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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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