# CFEL-UDSS

 2018-11-0716:12 [PUBDB-2018-04297] Conference Presentation et al Towards Chirp Control of XUV Free Electron Lasers 8th EPS-QEOD EUROPHOTON CONFERENCE, BarcelonaBarcelona, Spain, 2 Sep 2018 - 7 Sep 2018   We use 267nm femtosecond laser pulses to modulate electrons of a XUV free electron laser. By changing the chirp of this laser pulses we can influence the chirp of the generated XUV FEL pulses, which are characterized by THz streaking. [...] OpenAccess: Summary_Europhoton2018_MK20042018 - PDF PDF (PDFA); Towards Chirp Control of XUV Free Electron Lasers_MK_PUBDB - PPTX; 2018-10-3015:47 [PUBDB-2018-04069] Book/Report/Internal Report Pfluger, J. Field accuracy requirements for the undulator systems of the X-ray FELs at TESLA [DESY-TESLA-FEL-2000-14] TESLA-FEL Reports 11 pp. (2000) [10.3204/PUBDB-2018-04069]   In SASE FELs, the radiation power has to saturate in a single pass through the undulator. In the VUV and X-rayregime, with undulators ranging in length from several tens to hunderds of meters, even a few percent increase ingain length could mean a lengthening of the undulator by several meters. [...] OpenAccess: PDF PDF (PDFA); 2018-10-1414:32 [PUBDB-2018-03782] Poster et al PIPE: The Photon-Ion-Endstation at PETRA III for Experimental Studies of XUV-Photoprocesses in Small Quantum Systems Deutsche Tagung für Forschung mit Synchrotronstrahlung, Neutronen und Ionenstrahlen an Großgeräten, SNI 2018, GarchingGarching, Germany, 17 Sep 2018 - 19 Sep 2018   OpenAccess: PDF PDF (PDFA); 2018-01-1715:59 [PUBDB-2018-00674] Journal Article et al Near-K -edge single, double, and triple photoionization of $C^{+}$ ions Physical review / A 97(1), 013409 (2018) [10.1103/PhysRevA.97.013409]   Single, double, and triple ionization of the $C^{+}$ ion by a single photon have been investigated in the energy range 286 to 326 eV around the K-shell single-ionization threshold at an unprecedented level of detail. At energy resolutions as low as 12 meV, corresponding to a resolving power of 24 000, natural linewidths of the most prominent resonances could be determined [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2018-01-0916:17 [PUBDB-2018-00296] Journal Article et al High-resolution resonant inelastic extreme ultraviolet scattering from orbital and spin excitations in a Heisenberg antiferromagnet Physical review / B 96(18), 184420 (2017) [10.1103/PhysRevB.96.184420]   We report a high-resolution resonant inelastic extreme ultraviolet (EUV) scattering study of the quantum Heisenberg antiferromagnet KCoF$_3$. By tuning the EUV photon energy to the cobalt M$_{23}$ edge, a complete set of low-energy 3d spin-orbital excitations is revealed [...] OpenAccess: PDF PDF (PDFA); 2017-12-2213:55 [PUBDB-2017-14056] Journal Article et al Imaging the square of the correlated two-electron wave function of a hydrogen molecule Nature Communications 8(1), 2266 (2017) [10.1038/s41467-017-02437-9]   The toolbox for imaging molecules is well-equipped today. Some techniques visualize the geometrical structure, others the electron density or electron orbitals. [...] Restricted: PDF PDF (PDFA); 2017-11-2015:44 [PUBDB-2017-12132] Journal Article et al Quantum imaging with incoherently scattered light from a free-electron laser Nature physics 14, 126-129 (2017) [10.1038/nphys4301]   The advent of accelerator-driven free-electron lasers (FEL) has opened new avenues for high-resolution structure determination via diffraction methods that go far beyond conventional X-ray crystallography methods. These techniques rely on coherent scattering processes that require the maintenance of first-order coherence of the radiation field throughout the imaging procedure. [...] Restricted: PDF PDF (PDFA); 2017-10-2519:37 [PUBDB-2017-11558] Journal Article et al Near $L$-edge Single and Multiple Photoionization of Singly Charged Iron Ions The astrophysical journal 849(1), 5 (2017) [10.3847/1538-4357/aa8fcc]   Absolute cross sections for m-fold photoionization (m=1,...,6) of Fe+ by a single photon were measured employing the photon-ion merged-beams setup PIPE at the PETRA III synchrotron light source, operated by DESY in Hamburg, Germany. Photon energies were in the range 680-920 eV which covers the photoionization resonances associated with 2p and 2s excitation to higher atomic shells as well as the thresholds for 2p and 2s ionization. [...] Restricted: PDF PDF (PDFA); External link: Fulltext 2017-09-1214:07 [PUBDB-2017-10683] Journal Article et al Real-Time Elucidation of Catalytic Pathways in CO Hydrogenation on Ru The journal of physical chemistry letters 8(16), 3820 - 3825 (2017) [10.1021/acs.jpclett.7b01549]   The direct elucidation of the reaction pathways in heterogeneous catalysis has been challenging due to the short-lived nature of reaction intermediates. Here, we directly measured on ultrafast time scales the initial hydrogenation steps of adsorbed CO on a Ru catalyst surface, which is known as the bottleneck reaction in syngas and CO$_2$ reforming processes. [...] Published on 2017-07-31. Available in OpenAccess from 2018-07-31.: CO Hydrogenation Supplemental 2017.07.28 - Resubmitted JPCL - PDF PDF (PDFA); CO Hydrogenation 2017.07.30 - Resubmitted JPCL - PDF PDF (PDFA); Restricted: PDF PDF (PDFA); 2017-08-1916:18 [PUBDB-2017-09552] Journal Article/Contribution to a conference proceedings et al Photoionization and photofragmentation of $\mathrm{Lu}_{3}\mathrm{N@C}_{80}^{\mathrm{q}+}$ ions (q = 1,2,3) XXX International Conference on Photonic, Electronic, and Atomic Collisions, CairnsCairns, Australia, 25 Jul 2017 - 1 Aug 2017   Cross sections for photoionization and photofragmentation of singly, doubly and triply charged Lu3N@C80 ions have been measured using the photon-ion merged-beams technique at the PETRA III synchrotron light source. The measured spectra exhibit prominent resonance features at energies around the carbon K edge. [...] OpenAccess: 2017-ICPEAC-PIPE-Lu3N@C80 - PDF PDF (PDFA); Hellhund_2017_J._Phys.__Conf._Ser._875_032034 - PDF PDF (PDFA);