CFEL-UDSS

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2018-11-07
16:12
OpenAccess [PUBDB-2018-04297] Conference Presentation
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Towards Chirp Control of XUV Free Electron Lasers
8th EPS-QEOD EUROPHOTON CONFERENCE, BarcelonaBarcelona, Spain, 2 Sep 2018 - 7 Sep 20182018-09-022018-09-07  GO
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 - Download fulltextPDF Download fulltextPDF (PDFA); Towards Chirp Control of XUV Free Electron Lasers_MK_PUBDB - Download fulltextPPTX;

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2018-10-30
15:47
OpenAccess [PUBDB-2018-04069] Book/Report/Internal Report
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Field accuracy requirements for the undulator systems of the X-ray FELs at TESLA
[DESY-TESLA-FEL-2000-14]
TESLA-FEL Reports 11 pp. () [10.3204/PUBDB-2018-04069]  GO
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. [...]
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2018-10-14
14:32
OpenAccess [PUBDB-2018-03782] Poster
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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 20182018-09-172018-09-19  GO
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2018-01-17
15:59
OpenAccess [PUBDB-2018-00674] Journal Article
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Near-K -edge single, double, and triple photoionization of $C^{+}$ ions
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 [...]
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2018-01-09
16:17
OpenAccess [PUBDB-2018-00296] Journal Article
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High-resolution resonant inelastic extreme ultraviolet scattering from orbital and spin excitations in a Heisenberg antiferromagnet
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 [...]
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2017-12-22
13:55
DBCoverage [PUBDB-2017-14056] Journal Article
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Imaging the square of the correlated two-electron wave function of a hydrogen molecule
The toolbox for imaging molecules is well-equipped today. Some techniques visualize the geometrical structure, others the electron density or electron orbitals. [...]
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2017-11-20
15:44
[PUBDB-2017-12132] Journal Article
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Quantum imaging with incoherently scattered light from a free-electron laser
Nature physics 14, 126-129 () [10.1038/nphys4301]  GO
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. [...]
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2017-10-25
19:37
[PUBDB-2017-11558] Journal Article
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Near $L$-edge Single and Multiple Photoionization of Singly Charged Iron Ions
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. [...]
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2017-09-12
14:07
Embargoed OpenAccess [PUBDB-2017-10683] Journal Article
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Real-Time Elucidation of Catalytic Pathways in CO Hydrogenation on Ru
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. [...]
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2017-08-19
16:18
OpenAccess [PUBDB-2017-09552] Journal Article/Contribution to a conference proceedings
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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 20172017-07-252017-08-01 Journal of physics / Conference Series 875, 032034 () [10.1088/1742-6596/875/4/032034]  GO
Cross sections for photoionization and photofragmentation of singly, doubly and triply charged Lu<sub>3</sub>N@C<sub>80</sub> 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 - Download fulltextPDF Download fulltextPDF (PDFA); Hellhund_2017_J._Phys.__Conf._Ser._875_032034 - Download fulltextPDF Download fulltextPDF (PDFA);
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