# CFEL-UDSS

 2017-04-2109:21 [PUBDB-2017-01762] Journal Article et al Multiple Auger cycle photoionisation of manganese atoms by short soft x-ray pulses New journal of physics 19(4), 043002 (2017) [10.1088/1367-2630/aa660a]   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. [...] OpenAccess: PDF; External link: Fulltext 2017-04-1813:48 [PUBDB-2017-01676] Journal Article et al Photoionization of Ne Atoms and Ne$^{+}$ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections The astrophysical journal 836(2), 166 (2017) [10.3847/1538-4357/836/2/166]   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. [...] Restricted: PDF; External link: Fulltext 2017-03-1418:36 [PUBDB-2017-01374] Internal Report et al Quantum Imaging with Incoherently Scattered Light from a Free-Electron Laser 17 pp. (2017) [10.3204/PUBDB-2017-01374]   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. [...] OpenAccess: PDF; 2016-12-1913:19 [PUBDB-2016-06339] Journal Article et al Extreme ultraviolet resonant inelastic X-ray scattering (RIXS) at a seeded free-electron laser Scientific reports 6, 38796 (2016) [10.1038/srep38796]   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. [...] OpenAccess: PDF PDF (PDFA); 2016-12-0714:00 [PUBDB-2016-05994] Journal Article et al First light on 3$d$ photoionization of multiply charged xenon ions: a new photon-ion merged beam setup at PETRA III Journal of physics / Conference Series 488(14), 142006 (2014) [10.1088/1742-6596/488/14/142006]   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.. OpenAccess: PDF; 2016-12-0514:21 [PUBDB-2016-05879] Journal Article et al Chemical Bond Activation Observed with an X-ray Laser The journal of physical chemistry letters 7(18), 3647 - 3651 (2016) [10.1021/acs.jpclett.6b01543]   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.: PDF; 2016-11-2912:57 [PUBDB-2016-05705] Journal Article Wurth, W. Surface Science Studies with Free Electron Lasers: Real-Time Observations of Electronic Structure Changes during Reactions Synchrotron radiation news 29(3), 32 - 35 (2016) [10.1080/08940886.2016.1174045]   Restricted: PDF; 2016-11-2912:51 [PUBDB-2016-05704] Journal Article et al Two-electron processes in multiple ionization under strong soft-x-ray radiation Physical review / A 94(1), 013413 (2016) [10.1103/PhysRevA.94.013413]   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$^{7+}$. [...] Fulltext: PNG; OpenAccess: PDF PDF (PDFA); 2016-09-1915:09 [PUBDB-2016-03740] Journal Article et al Two-Particle Interference of Electron Pairs on a Molecular Level Physical review letters 117(8), 083002 (2016) [10.1103/PhysRevLett.117.083002]   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. [...] OpenAccess: PDF PDF (PDFA); 2016-05-0911:16 [PUBDB-2016-01890] Journal Article et al 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 Review of scientific instruments 87(4), 045116 (2016) [10.1063/1.4947516]   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. [...] Published on 2016-04-29. Available in OpenAccess from 2017-04-29.: PDF PDF (PDFA);