Eur.XFEL

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2018-04-18
18:06
[PUBDB-2018-01788] Journal Article
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Attosecond time–energy structure of X-ray free-electron laser pulses
The time–energy information of ultrashort X-ray free-electron laser pulses generated by the Linac Coherent Light Source is measured with attosecond resolution via angular streaking of neon 1s photoelectrons. The X-ray pulses promote electrons from the neon core level into an ionization continuum, where they are dressed with the electric field of a circularly polarized infrared laser. [...]
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2018-02-02
09:02
DBCoverage [PUBDB-2018-00999] Journal Article
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Diffraction based Hanbury Brown and Twiss interferometry at a hard x-ray free-electron laser
X-ray free-electron lasers (XFELs) provide extremely bright and highly spatially coherent x-rayradiation with femtosecond pulse duration. Currently, they are widely used in biology and materialscience. [...]
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2018-01-23
10:34
Embargoed OpenAccess [PUBDB-2018-00754] Journal Article
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Transferring the entatic-state principle to copper photochemistry
Nature chemistry 10, 355 – 362 (2018) [10.1038/nchem.2916]  GO
The entatic state denotes a distorted coordination geometry of a complex from its typical arrangement that generates an improvement to its function. The entatic-state principle has been observed to apply to copper electron-transfer proteins and it results in a lowering of the reorganization energy of the electron-transfer process. [...]
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2018-01-12
10:19
[PUBDB-2018-00592] Journal Article
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Materials for x-ray refractive lenses minimizing wavefront distortions
MRS bulletin 42(6), 430 - 436 (2017) [10.1557/mrs.2017.117]  GO
Refraction through curved surfaces, reflection from curved mirrors in grazing incidence, and diffraction from Fresnel zone plates are key hard x-ray focusing mechanisms. In this article, we present materials used for refractive x-ray lenses. [...]
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2018-01-11
13:18
OpenAccess [PUBDB-2018-00484] Journal Article
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Circular Dichroism in Multiphoton Ionization of Resonantly Excited $He^{+}$ Ions
Intense, circularly polarized extreme-ultraviolet and near-infrared (NIR) laser pulses are combined to double ionize atomic helium via the oriented intermediate He+(3p) resonance state. Applying angle-resolved electron spectroscopy, we find a large photon helicity dependence of the spectrum and the angular distribution of the electrons ejected from the resonance by NIR multiphoton absorption. [...]
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2018-01-10
14:41
[PUBDB-2018-00376] Journal Article
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Fabrication of diamond diffraction gratings for experiments with intense hard x-rays
The demands on optical components to tolerate high radiation dose and manipulate hard x-ray beams that can fit the experiment requirements, are constantly increasing due to the advancements in the available x-ray sources. Here we have successfully fabricated the transmission type gratings using diamond, with structure sizes ranging from few tens of nanometres up to micrometres, and aspect ratio of up to 20. [...]
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2018-01-09
10:44
OpenAccess [PUBDB-2018-00272] Journal Article
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Ultrashort Free-Electron Laser X-ray Pulses
For the investigation of processes happening on the time scale of the motion of bound electrons, well-controlled X-ray pulses with durations in the few-femtosecond and even sub-femtosecond range are a necessary prerequisite. Novel free-electron lasers sources provide these ultrashort, high-brightness X-ray pulses, but their unique aspects open up concomitant challenges for their characterization on a suitable time scale [...]
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2018-01-08
15:32
OpenAccess [PUBDB-2018-00266] Journal Article
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Saturation of a Ce:$\mathrm{Y}_{3}\mathrm{Al}_{5}\mathrm{O}_{12}$ scintillator response to ultra-short pulses of extreme ultraviolet soft X-ray and X-ray laser radiation
Investigations of radioluminescence saturation in monocrystalline cerium doped yttrium aluminum garnet (Ce:YAG) exposed to intense extreme ultraviolet (XUV), soft X-ray and X-ray radiation delivered from three free-electron lasers are described in this article. The measurements were performed with wavelengths of 98, 25.6, 13.5 and 0.15 nm. [...]
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2018-01-05
13:44
OpenAccess [PUBDB-2018-00199] Journal Article
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Photodissociation of Aligned $\mathrm{CH_3I}$ and $\mathrm{C_{6}H_{3}F_{2}I}$ Molecules Probed with Time-Resolved Coulomb Explosion Imaging by Site-Selective XUV Ionization
We explore time-resolved Coulomb explosion induced by intense, extreme ultraviolet (XUV) femtosecond pulses from a free-electron laser as a method to image photo-induced molecular dynamics in two molecules, iodomethane and 2,6-difluoroiodobenzene. At an excitation wavelength of 267 nm, the dominant reaction pathway in both molecules is neutral dissociation via cleavage of the carbon–iodine bond. [...]
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2018-01-03
17:18
OpenAccess [PUBDB-2018-00095] Contribution to a conference proceedings/Contribution to a book
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MCP Based Detectors Installation in European XFEL
8th International Particle Accelerator Conference, IPAC2017, Meeting locationCopenhagen, Denmark, 14 May 2017 - 19 May 20172017-05-142017-05-19 wepab132 (2017) [10.3204/PUBDB-2018-00095]  GO
An important task of the photon beam diagnostics at the European XFEL is providing reliable tools for measurements aiming at the search for and fine tuning of the FEL creating SASE process. Radiation detectors based on micro channel plates (MCP) will be use at the European XFEL. [...]
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