Eur.XFEL

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2017-08-09
15:15
DBCoverage [PUBDB-2017-09033] Journal Article
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Single-shot Monitoring of Ultrafast Processes via X-ray Streaking at a Free Electron Laser
ddc:000
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2017-08-08
14:44
[PUBDB-2017-08920] Contribution to a conference proceedings/Contribution to a book
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Terahertz-induced optical birefringence in liquid water
CLEO: Science and Innovations in Proceedings Conference on Lasers and Electro-Optics
Conference on Lasers and Electro-Optics, CLEO 2017, Meeting locationSan Jose,California, USA, 14 May 2017 - 19 May 20172017-05-142017-05-19
Washington, D.C. : OSA, STu3J.8 (2017) [10.1364/CLEO_SI.2017.STu3J.8] special issue: "CLEO: Science and Innovations"  GO
We have observed optical birefringence in neat water induced by single-cycle intense terahertz pulses. The refractive index changes are explained by the electronic polarizability modulated by molecular orientation driven by the strong terahertz electric field..
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2017-07-25
10:57
DBCoverage [PUBDB-2017-08413] Journal Article
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Single-shot determination of focused FEL wave fields using iterative phase retrieval
Optics express 25(15), 17892 - 17903 (2017) [10.1364/OE.25.017892]  GO
ddc:530
Determining fluctuations in focus properties is essential for many experiments at Self-Amplified-Spontaneous-Emission (SASE) based Free-Electron-Lasers (FELs), in particular for imaging single non-crystalline biological particles. We report on a diffractive imaging technique to fully characterize highly focused, single-shot pulses using an iterative phase retrieval algorithm, and benchmark it against an existing Hartmann wavefront sensor. [...]
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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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2017-06-15
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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2017-05-15
12:50
[PUBDB-2017-02890] Journal Article
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Structure and target interaction of a G-quadruplex RNA-aptamer
ddc:570
G-quadruplexes have recently moved into focus of research in nucleic acids, thereby evolving in scientific significance from exceptional secondary structure motifs to complex modulators of gene regulation. Aptamers (nucleic acid based ligands with recognition properties for a specific target) that form Gquadruplexes may have particular potential for therapeutic applications as they combine the characteristics of specific targeting and Gquadruplex mediated stability and regulation. [...]

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