CFEL-UDSS

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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. [...]
Published on 2017-07-31. Available in OpenAccess from 2018-07-31.: CO Hydrogenation Supplemental 2017.07.28 - Resubmitted JPCL - Download fulltextPDF Download fulltextPDF (PDFA); CO Hydrogenation 2017.07.30 - Resubmitted JPCL - Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);

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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. [...]
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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2017-08-19
16:06
OpenAccess [PUBDB-2017-09550] Journal Article/Contribution to a conference proceedings
; ; ; et al
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
; ; ; et al
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
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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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2016-12-19
13:19
OpenAccess [PUBDB-2016-06339] Journal Article
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Extreme ultraviolet resonant inelastic X-ray scattering (RIXS) at a seeded free-electron laser
ddc:000
In the past few years, we have been witnessing an increased interest for studying materials properties under non-equilibrium conditions. Several well established spectroscopies for experiments in the energy domain have been successfully adapted to the time domain with sub-picosecond time resolution. [...]
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2016-12-07
14:00
OpenAccess [PUBDB-2016-05994] Journal Article
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First light on 3$d$ photoionization of multiply charged xenon ions: a new photon-ion merged beam setup at PETRA III
ddc:530
A photon-ion merged beam endstation has been set up at the variable polarization XUV-beamline P04 of PETRA III in Hamburg. In a commissioning experiment first results could be obtained for multiple photoionization of Xe$^{q+}$ ions (q = 1,2,..,5) at photon energies around the 3d ionization threshold..
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2016-12-05
14:21
Embargoed OpenAccess [PUBDB-2016-05879] Journal Article
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Chemical Bond Activation Observed with an X-ray Laser
ddc:530
The concept of bonding and antibonding orbitals is fundamental in chemistry. The population of those orbitals and the energetic difference between the two reflect the strength of the bonding interaction. [...]
Published on 2016-09-01. Available in OpenAccess from 2017-09-01.: Download fulltextPDF;

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2016-11-29
12:57
[PUBDB-2016-05705] Journal Article

Surface Science Studies with Free Electron Lasers: Real-Time Observations of Electronic Structure Changes during Reactions
ddc:530
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