CFEL-UDSS

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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
ddc:530
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
ddc:500
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
ddc:530
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
ddc:520
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
ddc:530
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 ${{\rm{Lu}}}_{3}{{\rm{N@C}}}_{80}^{{\rm{q}}+}$ ions (q = 1,2,3)
XXX International Conference on Photonic, Electronic, and Atomic Collisions, Meeting locationCairns, Australia, 25 Jul 2017 - 1 Aug 20172017-07-252017-08-01 Journal of physics / Conference Series 875, 032034 (2017) [10.1088/1742-6596/875/4/032034]  GO
ddc:530
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. [...]
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2017-08-19
16:06
OpenAccess [PUBDB-2017-09550] Journal Article/Contribution to a conference proceedings
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Photoionization of Ne$^{+}$ ions and Ne atoms near the K edge
XXX International Conference on Photonic, Electronic, and Atomic Collisions, Meeting locationCairns, Australia, 26 Jul 2017 - 1 Aug 20172017-07-262017-08-01 Journal of physics / Conference Series 875, 022044 (2017) [10.1088/1742-6596/875/3/022044]  GO
ddc:530
Absolute cross sections for photoprocesses near the K edge of Ne$^{+}$ ions and neutral Ne atoms have been determined at resolving powers up to 27000 facilitating the precise determination of natural widths of the most prominent resonances as well as the associated transition probabilities and branching ratios.
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2017-04-21
09:21
OpenAccess [PUBDB-2017-01762] Journal Article
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Multiple Auger cycle photoionisation of manganese atoms by short soft x-ray pulses
ddc:530
The multiple ionisation of atomic Mn, excited at (photon energy: 52.1eV) and above (photon energy: 61.1eV) the discrete giant 3p–3d resonance, was studied using high irradiation free-electron-laser soft x-ray pulses from the BL2 beamline of FLASH, DESY, Hamburg. In particular, the impact of the giant resonance on the ionisation mechanism was investigated. [...]
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2017-04-18
13:48
OpenAccess [PUBDB-2017-01676] Journal Article
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Photoionization of Ne Atoms and Ne$^{+}$ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections
ddc:520
Single, double, and triple photoionization of Ne$^{+}$ ions by single photons have been investigated at the synchrotron radiation source PETRA III in Hamburg, Germany. Absolute cross-sections were measured by employing the photon–ion merged-beams technique. [...]
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2017-03-14
18:36
OpenAccess [PUBDB-2017-01374] Internal Report
; ; ; et al
Quantum Imaging with Incoherently Scattered Light from a Free-Electron Laser
The advent of accelerator-driven x-ray 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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