CFEL-UDSS

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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
[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
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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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2016-11-29
12:51
OpenAccess [PUBDB-2016-05704] Journal Article
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Two-electron processes in multiple ionization under strong soft-x-ray radiation
ddc:530
In a combined experimental and theoretical study we have investigated the ionization of atomic argon upon irradiation with intense soft-x-ray pulses of 105 eV photon energy from the free-electron laser FLASH. The measured ion yields show charge states up to Ar$^{7+}$. [...]
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2016-09-19
15:09
OpenAccess [PUBDB-2016-03740] Journal Article
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Two-Particle Interference of Electron Pairs on a Molecular Level
ddc:550
We investigate the photodouble ionization of H$_2$ molecules with 400 eV photons. We find that theemitted electrons do not show any sign of two-center interference fringes in their angular emissiondistributions if considered separately. [...]
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2016-05-09
11:16
Embargoed OpenAccess [PUBDB-2016-01890] Journal Article
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New experimental perspectives for soft x-ray absorption spectroscopies at ultra-low temperatures below 50 mK and in high magnetic fields up to 7 T
ddc:530
A new ultra-low temperature experiment including a superconducting vector magnet has been developed for soft x-ray absorption spectroscopy experiments at third generation synchrotron light sources. The sample is cooled below 50 mK by a cryogen free 3He-4He dilution refrigerator. [...]
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