# FS-FLASH-D

 2017-06-0817:06 [PUBDB-2017-04558] Journal Article et al Communication: Direct evidence for sequential dissociation of gas-phase Fe(CO)$_5$ via a singlet pathway upon excitation at 266 nm The journal of chemical physics 146(21), 211103 (2017) [10.1063/1.4984774]   We prove the hitherto hypothesized sequential dissociation of Fe(CO)$_5$ in the gas phase upon photoexcitation at 266 nm via a singlet pathway with time-resolved valence and core-level photoelectron spectroscopy with an x-ray free-electron laser. Valence photoelectron spectra are used to identify free CO molecules and to determine the time constants of stepwise dissociation to Fe(CO)$_4$ within the temporal resolution of the experiment and further to Fe(CO)$_3$ within 3 ps [...] OpenAccess: PDF PDF (PDFA); 2017-05-1010:10 [PUBDB-2017-02555] Journal Article et al Alignment, orientation, and Coulomb explosion of difluoroiodobenzene studied with the pixel imaging mass spectrometry (PImMS) camera The journal of chemical physics 147(1), 013933 (2017) [10.1063/1.4982220]   Laser-induced adiabatic alignment and mixed-field orientation of 2,6-difluoroiodobenzene (C$_6$H$_3$F$_2$I) molecules are probed by Coulomb explosion imaging following either near-infrared strong-field ionization or extreme-ultraviolet multi-photon inner-shell ionization using free-electron laser pulses. The resulting photoelectrons and fragment ions are captured by a double-sided velocity map imaging spectrometer and projected onto two position-sensitive detectors. [...] Fulltext: GIF; OpenAccess: PDF; 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 2017-04-1210:21 [PUBDB-2017-01661] Journal Article et al Jitter-correction for IR/UV-XUV pump-probe experiments at the FLASH free-electron laser New journal of physics 19(4), 043009 (2017) [10.1088/1367-2630/aa652d]   In pump-probe experiments employing a free-electron laser (FEL) in combination with a synchronized optical femtosecond laser, the arrival-time jitter between the FEL pulse and the optical laser pulse often severely limits the temporal resolution that can be achieved. Here, we present a pump-probe experiment on the UV-induced dissociation of 2,6-difluoroiodobenzene $(C_{6}H_{3}F_{2}I)$ molecules performed at the FLASH FEL that takes advantage of recent upgrades of the FLASH timing and synchronization system to obtain high-quality data that are not limited by the FEL arrival-time jitter. [...] Fulltext: PNG; OpenAccess: PDF; 2017-02-2113:22 [PUBDB-2017-01061] Poster et al Ultrafast fragmentation dynamics of Phenanthrene and Pyrene after photoionization at 30.3 nm wavelength DESY User Meeting 2017, Meeting locationHamburg, Germany, 26 Jan 2017 - 27 Jan 2017 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; 2016-11-2814:44 [PUBDB-2016-05682] Journal Article et al Time-resolved x-ray imaging of a laser-induced nanoplasma and its neutral residuals New journal of physics 18(4), 043017 (2016) [10.1088/1367-2630/18/4/043017]   The evolution of individual, large gas-phase xenon clusters, turned into a nanoplasma by a high power infrared laser pulse, is tracked from femtoseconds up to nanoseconds after laser excitation via coherent diffractive imaging, using ultra-short soft x-ray free electron laser pulses. A decline of scattering signal at high detection angles with increasing time delay indicates a softening of the cluster surface. [...] OpenAccess: PDF PDF (PDFA); 2016-11-1014:49 [PUBDB-2016-04910] Journal Article et al Mapping chemical bonding of reaction intermediates with femtosecond X-ray laser spectroscopy   We determine the pathways in the photo-dissociation reactions of Fe(CO)$_5$ both in the gas phase and in solution by mapping the valence electronic structure of the reaction intermediates with femtosecond X-ray laser spectroscopy.. OpenAccess: PDF PDF (PDFA); 2016-11-1010:20 [PUBDB-2016-04837] Journal Article et al Role of heat accumulation in the multi-shot damage of silicon irradiated with femtosecond XUV pulses at a 1 MHz repetition rate Optics express 24(14), 15468 - 15477 (2016) [10.1364/OE.24.015468]   The role played by heat accumulation in multi-shot damage of silicon was studied. Bulk silicon samples were exposed to intense XUV monochromatic radiation of a 13.5 nm wavelength in a series of 400 femtosecond pulses, repeated with a 1 MHz rate (pulse trains) at the FLASH facility in Hamburg. [...] OpenAccess: PDF PDF (PDFA);