# Eur.XFEL

 2018-02-0209:02 [PUBDB-2018-00999] Journal Article et al Diffraction based Hanbury Brown and Twiss interferometry at a hard x-ray free-electron laser Scientific reports 8, 2219 (2018) [10.1038/s41598-018-19793-1]   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. [...] Restricted: PDF PDF (PDFA); 2018-01-2310:34 [PUBDB-2018-00754] Journal Article et al Transferring the entatic-state principle to copper photochemistry Nature chemistry n/a, n/a - n/a (2018) [10.1038/nchem.2916] 2018-01-1210:19 [PUBDB-2018-00592] Journal Article et al Materials for x-ray refractive lenses minimizing wavefront distortions MRS bulletin 42(6), 430 - 436 (2017) [10.1557/mrs.2017.117]   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. [...] Restricted: PDF PDF (PDFA); 2018-01-1113:18 [PUBDB-2018-00484] Journal Article et al Circular Dichroism in Multiphoton Ionization of Resonantly Excited $He^{+}$ Ions Physical review letters 118(1), 013002 (2017) [10.1103/PhysRevLett.118.013002]   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. [...] OpenAccess: PDF PDF (PDFA); 2018-01-1014:41 [PUBDB-2018-00376] Journal Article et al Fabrication of diamond diffraction gratings for experiments with intense hard x-rays Microelectronic engineering 176, 75 - 78 (2017) [10.1016/j.mee.2017.02.002]   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. [...] Fulltext: PDF PDF (PDFA); Restricted: PDF PDF (PDFA); 2018-01-0910:44 [PUBDB-2018-00272] Journal Article et al Ultrashort Free-Electron Laser X-ray Pulses Applied Sciences 7(9), 915 - (2017) [10.3390/app7090915]   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 [...] OpenAccess: PDF PDF (PDFA); 2018-01-0815:32 [PUBDB-2018-00266] Journal Article et al 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 Optical materials express 7(3), 665 - 675 (2017) [10.1364/OME.7.000665]   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. [...] OpenAccess: PDF PDF (PDFA); 2018-01-0513:44 [PUBDB-2018-00199] Journal Article et al 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 Structural dynamics 5(1), 014301 - (2018) [10.1063/1.4998648]   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. [...] OpenAccess: PDF PDF (PDFA); 2018-01-0317:18 [PUBDB-2018-00095] Contribution to a conference proceedings/Contribution to a book et al MCP Based Detectors Installation in European XFEL 8th International Particle Accelerator Conference, IPAC17, Meeting locationCopenhagen, Denmark, 15 May 2017 - 19 May 2017 wepab132 (2017) [10.3204/PUBDB-2018-00095]   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. [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2017-12-2015:10 [PUBDB-2017-13877] Journal Article et al Observation of Reverse Saturable Absorption of an X-ray Laser Physical review letters 119(7), 075002 (2017) [10.1103/PhysRevLett.119.075002]   A nonlinear absorber in which the excited state absorption is larger than the ground state can undergo a process called reverse saturable absorption. It is a well-known phenomenon in laser physics in the optical regime, but is more difficult to generate in the x-ray regime, where fast nonradiative core electron transitions typically dominate the population kinetics during light matter interactions [...] OpenAccess: PDF PDF (PDFA);