Eur.XFEL

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2019-02-15
10:04
[PUBDB-2019-01129] Journal Article
et al
Structural, elastic and vibrational properties of celestite, $SrSO_4$, from synchrotron x-ray diffraction, thermal diffuse scattering and Raman scattering
In order to resolve inconsistencies encountered in published data for SrSO$_4$, the elasticity and the phase stability of celestite has been studied using thermal diffuse scattering, high pressure powder synchrotron x­ray diffraction, Raman scattering and DFT calculations. The structure of SrSO$_4$ is found to be stable up to 62 GPa at ambient temperature. [...]
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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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2019-01-30
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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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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2019-01-08
10:16
OpenAccess [PUBDB-2019-00093] Journal Article
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Symmetry breakdown of electron emission in extreme ultraviolet photoionization of argon
Short wavelength free-electron lasers (FELs), providing pulses of ultrahigh photon intensity, have revolutionized spectroscopy on ionic targets. Their exceptional photon flux enables multiple photon absorptions within a single femtosecond pulse, which in turn allows for deep insights into the photoionization process itself as well as into evolving ionic states of a target [...]
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2019-01-08
09:41
OpenAccess [PUBDB-2019-00090] Journal Article
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All-optical structuring of laser-driven proton beam profiles
Extreme field gradients intrinsic to relativistic laser-interactions with thin solid targets enable compact MeV proton accelerators with unique bunch characteristics. Yet, direct control of the proton beam profile is usually not possible. [...]
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2019-01-08
09:29
Embargoed OpenAccess [PUBDB-2019-00086] Journal Article
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Structural Changes in a Single GaN Nanowire under Applied Voltage Bias
Nano letters 18(9), 5446 - 5452 () [10.1021/acs.nanolett.8b01802]  GO
GaN nanowires (NWs) are promising building blocks for future optoelectronic devices and nanoelectronics. They exhibit stronger piezoelectric properties than bulk GaN. [...]
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2019-01-07
15:26
OpenAccess [PUBDB-2019-00062] Journal Article
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Femtosecond profiling of shaped x-ray pulses
Arbitrary manipulation of the temporal and spectral properties of x-ray pulses at free-electron lasers would revolutionize many experimental applications. At the Linac Coherent Light Source at Stanford National Accelerator Laboratory, the momentum phase-space of the free-electron laser driving electron bunch can be tuned to emit a pair of x-ray pulses with independently variable photon energy and femtosecond delay [...]
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