Eur.XFEL

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2017-06-22
15:29
OpenAccess [PUBDB-2017-05870] Journal Article
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BioSAXS Sample Changer: a robotic sample changer for rapid and reliable high-throughput X-ray solution scattering experiments
ddc:570
Small-angle X-ray scattering (SAXS) of macromolecules in solution is in increasing demand by an ever more diverse research community, both academic and industrial. To better serve user needs, and to allow automated and high-throughput operation, a sample changer (BioSAXS Sample Changer) that is able to perform unattended measurements of up to several hundred samples per day has been developed. [...]
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2017-06-15
12:49
[PUBDB-2017-05074] Journal Article
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Quantifying Angular Correlations between the Atomic Lattice and the Superlattice of Nanocrystals Assembled with Directional Linking
Nano letters 17(6), 3511 - 3517 (2017) [10.1021/acs.nanolett.7b00584]  GO
ddc:540
We show that the combination of X-ray scatteringwith a nanofocused beam and X-ray cross correlation analysis is anefficient way for the full structural characterization of mesocrystallinenanoparticle assemblies with a single experiment. We analyze severalhundred diffraction patterns at individual sample locations, that is,individual grains, to obtain a meaningful statistical distribution of thesuperlattice and atomic lattice ordering. [...]
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2017-06-09
10:53
OpenAccess [PUBDB-2017-04587] Journal Article
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Mapping few-femtosecond slices of ultra-relativistic electron bunches
ddc:000
Free-electron lasers are unique sources of intense and ultra-short x-ray pulses that led to major scientific breakthroughs across disciplines from matter to materials and life sciences. The essential element of these devices are micrometer-sized electron bunches with high peak currents, low energy spread, and low emittance. [...]
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2017-06-08
17:06
OpenAccess [PUBDB-2017-04558] Journal Article
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Communication: Direct evidence for sequential dissociation of gas-phase Fe(CO)$_5$ via a singlet pathway upon excitation at 266 nm
ddc:540
We prove the hitherto hypothesized sequential dissociation of Fe(CO)$_5$ in the gas phase upon photoexcitation at 266 nm via a singlet pathway with time-resolved valence and core-level photoelectron spectroscopy with an x-ray free-electron laser. Valence photoelectron spectra are used to identify free CO molecules and to determine the time constants of stepwise dissociation to Fe(CO)$_4$ within the temporal resolution of the experiment and further to Fe(CO)$_3$ within 3 ps [...]
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2017-06-06
14:18
OpenAccess [PUBDB-2017-04342] Contribution to a conference proceedings
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OCELOT as a Framework for Beam Dynamics Simulations of X-RAY Sources
8th International Particle Accelerator Conference , IPAC17, Meeting locationCopenhagen, Denmark, 15 May 2017 - 19 May 20172017-05-152017-05-19
4 p. (2017) [10.3204/PUBDB-2017-04342]  GO
We describe the OCELOT open source project focusing on new beam dynamics simulation capabilities of the whole machine in modern electron-based x-ray sources. Numerical approaches for particle tracking and field calculations are discussed. [...]
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2017-05-22
14:41
OpenAccess [PUBDB-2017-03368] Journal Article
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Probing Dynamics in Colloidal crystals with pump-probe experiments at LCLS Methodololgy and analysis
Seminar, Meeting locationHamburg, Germany,
Applied Sciences 7(5), 519 (2017) [10.3390/app7050519]  GO
ddc:600
We present results of the studies of dynamics in colloidal crystals performed by pump-probeexperiments using an X-ray free-electron laser (XFEL). Colloidal crystals were pumped with aninfrared laser at a wavelength of 800 nm with varying power and probed by XFEL pulses at anenergy of 8 keV with a time delay up to 1000 ps. [...]
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2017-04-24
12:54
OpenAccess [PUBDB-2017-01819] Preprint/Report
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Radiation by Moving Charges
[DESY-17-047; arXiv:1704.01843]
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It is generally accepted that the dynamics of relativistic particles in the lab frame can be described by taking into account the relativistic dependence of the particles momenta on the velocity, with no reference to Lorentz transformations. The electrodynamics problem can then be treated within a 'single inertial frame' description. [...]
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2017-04-24
12:51
OpenAccess [PUBDB-2017-01817] Preprint/Report
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Automatic Tuning of Free Electron Lasers
[DESY-17-054; arXiv:1704.02335]
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Existing FEL facilities often suffer from stability issues: so electron orbit, transverse electron optics, electron bunch compression and other parameters have to be readjusted often to account for drifts in performance of various components. The tuning procedures typically employed in operation are often manual and lengthy. [...]
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2017-04-19
10:18
[PUBDB-2017-01684] Journal Article
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Structure Studies of the Bond-Orientational order and the hexatic-smectic transition in liquid crystals of various compositions
Soft matter 13(17), 3240 - 3252 (2017) [10.1039/C7SM00343A]  GO
ddc:530
We report on the X-ray studies of freely suspended hexatic films of three different liquid crystal compounds. By applying angular X-ray cross-correlation analysis (XCCA) to the measured diffraction patterns the parameters of the bond-orientational (BO) order in the hexatic phase were directly determined [...]

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2017-02-13
10:11
[PUBDB-2017-00953] Journal Article
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Atomic Structure of Granulin Determined from Native Nanocrystalline Granulovirus Using an X-ray Free-Electron Laser
ddc:000
To understand how molecules function in biological systems, new methods are required to obtain atomic resolution structures from biological material under physiological conditions. Intense femtosecond-duration pulses from X-ray free-electron lasers (XFELs) can outrun most damage processes, vastly increasing the tolerable dose before the specimen is destroyed [...]

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