FS-FLASH-D

 2017-08-1916:18 [PUBDB-2017-09552] Journal Article/Contribution to a conference proceedings et al 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 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); 2017-08-1916:12 [PUBDB-2017-09551] Journal Article/Contribution to a conference proceedings et al Photoionization and photofragmentation of ${{\rm{Sc}}}_{3}{{\rm{N@C}}}_{80}^{+}$ at energies from the carbon K edge to the scandium L and nitrogen K edges XXX International Conference on Photonic, Electronic, and Atomic Collisions, Meeting locationCairns, Australia, 25 Jul 2017 - 1 Aug 2017   Photoionization of endohedral ${{\rm{Sc}}}_{3}{{\rm{N@C}}}_{80}^{+}$ fullerene ions is investigated using synchrotron radiation in the energy range 280 to 420 eV. In the product channels ${{\rm{Sc}}}_{3}{{\rm{N@C}}}_{80}^{2+}$ and ${{\rm{Sc}}}_{3}{{\rm{N@C}}}_{78}^{2+}$ clear signaiures of the cross section contributions arising from L-shell photoabsorption by the encapsulated Sc atoms have been detected [...] OpenAccess: PDF PDF (PDFA); 2017-08-1916:06 [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 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 2017-08-0915:15 [PUBDB-2017-09033] Journal Article et al Single-shot Monitoring of Ultrafast Processes via X-ray Streaking at a Free Electron Laser Scientific reports 7(1), 7253 (2017) [10.1038/s41598-017-07069-z]   The advent of x-ray free electron lasers has extended the unique capabilities of resonant x-ray spectroscopy techniques to ultrafast time scales. Here, we report on a novel experimental method that allows retrieving with a single x-ray pulse the time evolution of an ultrafast process, not only at a few discrete time delays, but continuously over an extended time window [...] OpenAccess: PDF PDF (PDFA); 2017-07-1316:21 [PUBDB-2017-07579] Preprint/Report et al Alignment, Orientation, and Coulomb Explosion of Difluoroiodobenzene Studied with the Pixel Imaging Mass Spectrometry (PImMS) Camera [arXiv:1706.08376] 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. [...] OpenAccess: PDF PDF (PDFA); 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] Report/Journal Article et al Alignment, orientation, and Coulomb explosion of difluoroiodobenzene studied with the pixel imaging mass spectrometry (PImMS) camera [arXiv:1706.08376] 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. [...] OpenAccess: 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;