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2017-07-19
14:45
[PUBDB-2017-07989] Journal Article
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Disentangling magnetic order on nanostructured surfaces

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2017-07-12
20:33
OpenAccess [PUBDB-2017-07483] Book/Report/Dissertation / PhD Thesis

A New Fixed-Target Approach for Serial Crystallography at Synchrotron Light Sources and X-ray Free Electron Lasers
[DESY-THESIS-2017-027]
DESY-THESIS 185 pp. (2017) [10.3204/PUBDB-2017-07483] = University of Hamburg, Diss., 2016  GO
In the framework of this thesis, a new method for high-speed fixed-target serial crystallography experiments and its applicability to biomacromolecular crystallography at both synchrotron light sources and X-ray free electron lasers (XFELs) is presented. The method is based on a sample holder, which can carry up to 20,000 microcrystals and which is made of single-crystalline silicon. [...]
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2017-07-07
23:28
OpenAccess [PUBDB-2017-07138] Journal Article

Coherent THz Transient Spin Currents by Spin Pumping
ddc:550
The generation of short spin current pulses is the basis for fast spintronic devices. In thin bilayer systems consisting of a nonmagnetic metal and a ferromagnet, a pure spin current is induced by a precessing magnetization into the nonmagnetic layer by spin pumping [...]
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2017-07-01
16:38
[PUBDB-2017-06548] Journal Article
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Rapid cadmium SAD phasing at the standard wavelength (1Å)
ddc:570
Cadmium ions can be effectively used to promote crystal growth and for experimental phasing. Here, the use of cadmium ions as a suitable anomalous scatterer at the standard wavelength of 1 Å is demonstrated. [...]
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2017-06-23
10:06
OpenAccess [PUBDB-2017-05924] Journal Article
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Statistical properties of a free-electron laser revealed by Hanbury Brown?Twiss interferometry
ddc:530
We present a comprehensive experimental analysis of statistical properties of the self-amplified spontaneous emission free-electron laser (FEL) FLASH by means of Hanbury Brown and Twiss interferometry. The experiments were performed at FEL wavelengths of 5.5, 13.4, and 20.8 nm [...]
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2017-06-20
13:22
[PUBDB-2017-05548] Journal Article
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High-speed fixed-target serial virus crystallography
ddc:570
We report a method for serial X-ray crystallography at X-ray free-electron lasers (XFELs), which allows for full use of the current 120-Hz repetition rate of the Linear Coherent Light Source (LCLS). Using a micropatterned silicon chip in combination with the high-speed Roadrunner goniometer for sample delivery, we were able to determine the crystal structures of the picornavirus bovine enterovirus 2 (BEV2) and the cytoplasmic polyhedrosis virus type 18 polyhedrin, with total data collection times of less than 14 and 10 min, respectively. [...]
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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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2017-05-23
10:15
OpenAccess [PUBDB-2017-03398] Journal Article
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Split-and-delay Unit for FEL Interferometry in the XUV Spectral Range
ddc:600
In this work we present a reflective split-and-delay unit (SDU) developed for interferometric time-resolved experiments utilizing an (extreme ultraviolet) XUV pump–XUV probe scheme with focused free-electron laser beams. The developed SDU overcomes limitations for phase-resolved measurements inherent to conventional two-element split mirrors by a special design using two reflective lamellar gratings. [...]
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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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