# CFEL-UDSS

 2018-01-1715:59 [PUBDB-2018-00674] Journal Article et al Near-K -edge single, double, and triple photoionization of $C^{+}$ ions Physical review / A 97(1), 013409 (2018) [10.1103/PhysRevA.97.013409]   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 [...] OpenAccess: PDF PDF (PDFA); External link: Fulltext 2018-01-0916:17 [PUBDB-2018-00296] Journal Article et al High-resolution resonant inelastic extreme ultraviolet scattering from orbital and spin excitations in a Heisenberg antiferromagnet Physical review / B 96(18), 184420 (2017) [10.1103/PhysRevB.96.184420]   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 [...] OpenAccess: PDF PDF (PDFA); 2017-12-2213:55 [PUBDB-2017-14056] Journal Article et al Imaging the square of the correlated two-electron wave function of a hydrogen molecule Nature Communications 8(1), 2266 (2017) [10.1038/s41467-017-02437-9]   The toolbox for imaging molecules is well-equipped today. Some techniques visualize the geometrical structure, others the electron density or electron orbitals. [...] Restricted: PDF PDF (PDFA); 2017-11-2015:44 [PUBDB-2017-12132] Journal Article et al Quantum imaging with incoherently scattered light from a free-electron laser Nature physics 14, 126-129 (2017) [10.1038/nphys4301]   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. [...] Restricted: PDF PDF (PDFA); 2017-10-2519:37 [PUBDB-2017-11558] Journal Article et al Near $L$-edge Single and Multiple Photoionization of Singly Charged Iron Ions The astrophysical journal 849(1), 5 (2017) [10.3847/1538-4357/aa8fcc]   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. [...] Restricted: PDF PDF (PDFA); External link: Fulltext 2017-09-1214:07 [PUBDB-2017-10683] Journal Article et al Real-Time Elucidation of Catalytic Pathways in CO Hydrogenation on Ru The journal of physical chemistry letters 8(16), 3820 - 3825 (2017) [10.1021/acs.jpclett.7b01549]   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 - PDF PDF (PDFA); CO Hydrogenation 2017.07.30 - Resubmitted JPCL - PDF PDF (PDFA); Restricted: PDF PDF (PDFA); 2017-08-1916:18 [PUBDB-2017-09552] Journal Article/Contribution to a conference proceedings et al 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 2017   Cross sections for photoionization and photofragmentation of singly, doubly and triply charged Lu3N@C80 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 - PDF PDF (PDFA); Hellhund_2017_J._Phys.__Conf._Ser._875_032034 - PDF PDF (PDFA); 2017-08-1916:06 [PUBDB-2017-09550] Journal Article/Contribution to a conference proceedings et al Photoionization of $\mathrm{Ne^{+}}$ ions and Ne atoms near the $\mathrm{K}$ edge XXX International Conference on Photonic, Electronic, and Atomic Collisions, CairnsCairns, Australia, 26 Jul 2017 - 1 Aug 2017   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.. OpenAccess: PDF PDF (PDFA); External link: Fulltext 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 $\mathrm{Ne^{+}}$ 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. [...] OpenAccess: PDF; External link: Fulltext