# Eur.XFEL

 2019-02-1510:04 [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 Journal of physics / Condensed matter 31(5), 055703 (2019) [10.1088/1361-648X/aaf0ef]   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. [...] Restricted: PDF PDF (PDFA); 2019-02-1314:30 [PUBDB-2019-01075] Journal Article et al The Adaptive Gain Integrating Pixel Detector at the European XFEL Journal of synchrotron radiation 26(1), 74 - 82 (2019) [10.1107/S1600577518016077]   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. [...] OpenAccess: PDF PDF (PDFA); 2019-01-3015:23 [PUBDB-2019-00875] Journal Article et al Roadmap of ultrafast x-ray atomic and molecular physics Journal of physics / B 51(3), 032003 (2018) [10.1088/1361-6455/aa9735]   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 [...] OpenAccess: PDF PDF (PDFA); 2019-01-3015:18 [PUBDB-2019-00874] Journal Article et al Stimulated X-Ray Emission Spectroscopy in Transition Metal Complexes Physical review letters 120(13), 133203 (2018) [10.1103/PhysRevLett.120.133203]   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 [...] OpenAccess: PDF PDF (PDFA); 2019-01-1616:27 [PUBDB-2019-00538] Journal Article et al Pressure-induced amorphization in plagioclase feldspars: A time-resolved powder diffraction study during rapid compression Earth and planetary science letters 507, 166 - 174 (2019) [10.1016/j.epsl.2018.11.038]   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. [...] 2019-01-0810:17 [PUBDB-2019-00094] Journal Article et al Evidence of a first-order smectic-hexatic transition and its proximity to a tricritical point in smectic films Physical review / E 98(5), 052703 (2018) [10.1103/PhysRevE.98.052703]   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 [...] OpenAccess: PDF PDF (PDFA); 2019-01-0810:16 [PUBDB-2019-00093] Journal Article et al Symmetry breakdown of electron emission in extreme ultraviolet photoionization of argon Nature Communications 9(1), 4659 (2018) [10.1038/s41467-018-07152-7]   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 [...] OpenAccess: PDF PDF (PDFA); 2019-01-0809:41 [PUBDB-2019-00090] Journal Article et al All-optical structuring of laser-driven proton beam profiles Nature Communications 9(1), 5292 (2018) [10.1038/s41467-018-07756-z]   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. [...] OpenAccess: PDF PDF (PDFA); 2019-01-0809:29 [PUBDB-2019-00086] Journal Article et al Structural Changes in a Single GaN Nanowire under Applied Voltage Bias Nano letters 18(9), 5446 - 5452 (2018) [10.1021/acs.nanolett.8b01802]   GaN nanowires (NWs) are promising building blocks for future optoelectronic devices and nanoelectronics. They exhibit stronger piezoelectric properties than bulk GaN. [...] Published on 2018-07-23. Available in OpenAccess from 2019-07-23.: PDF PDF (PDFA); Restricted: PDF PDF (PDFA); 2019-01-0715:26 [PUBDB-2019-00062] Journal Article et al Femtosecond profiling of shaped x-ray pulses New journal of physics 20(3), 033008 (2018) [10.1088/1367-2630/aab548]   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 [...] OpenAccess: PDF PDF (PDFA);