FS-FLASH-D

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2017-11-09
10:46
OpenAccess [PUBDB-2017-11808] Journal Article
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Coulomb-explosion imaging of concurrent CH$_{2}$BrI photodissociation dynamics
ddc:530
The dynamics following laser-induced molecular photodissociation of gas-phase CH$_{2}$BrI at 271.6 nm were investigated by time-resolved Coulomb-explosion imaging using intense near-IR femtosecond laser pulses. The observed delay-dependent photofragment momenta reveal that CH$_{2}$BrI undergoes C-I cleavage, depositing 65.6% of the available energy into internal product states, and that absorption of a second UV photon breaks the C-Br bond ofCH$_{2}$Br. [...]
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2017-11-08
18:42
OpenAccess [PUBDB-2017-11787] Journal Article
; ; ; et al
The FLASH Facility: Advanced Options for FLASH2 and Future Perspectives
ddc:600
Since 2016, the two free-electron laser (FEL) lines FLASH1 and FLASH2 have been run simultaneously for users at DESY in Hamburg. With the installation of variable gap undulators in the new FLASH2 FEL line, many new possibilities have opened up in terms of photon parameters for experiments. [...]
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2017-08-19
16:18
OpenAccess [PUBDB-2017-09552] Journal Article/Contribution to a conference proceedings
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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 20172017-07-252017-08-01 Journal of physics / Conference Series 875, 032034 (2017) [10.1088/1742-6596/875/4/032034]  GO
ddc:530
Cross sections for photoionization and photofragmentation of singly, doubly and triply charged Lu<sub>3</sub>N@C<sub>80</sub> 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. [...]
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2017-08-19
16:12
OpenAccess [PUBDB-2017-09551] Journal Article/Contribution to a conference proceedings
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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 20172017-07-252017-08-01 Journal of physics / Conference Series 875, 032033 (2017) [10.1088/1742-6596/875/4/032033]  GO
ddc:530
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 [...]
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2017-08-19
16:06
OpenAccess [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 20172017-07-262017-08-01 Journal of physics / Conference Series 875, 022044 (2017) [10.1088/1742-6596/875/3/022044]  GO
ddc:530
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.
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2017-08-09
15:15
OpenAccess [PUBDB-2017-09033] Journal Article
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Single-shot Monitoring of Ultrafast Processes via X-ray Streaking at a Free Electron Laser
ddc:000
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 [...]
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2017-07-13
16:21
OpenAccess [PUBDB-2017-07579] Preprint/Report
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Alignment, Orientation, and Coulomb Explosion of Difluoroiodobenzene Studied with the Pixel Imaging Mass Spectrometry (PImMS) Camera
[arXiv:1706.08376] ddc:540
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. [...]
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2017-06-08
17:06
OpenAccess [PUBDB-2017-04558] Journal Article
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Communication: Direct evidence for sequential dissociation of gas-phase Fe(CO)$_5$ via a singlet pathway upon excitation at 266 nm
ddc:540
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 [...]
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2017-05-10
10:10
OpenAccess [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] ddc:540
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. [...]
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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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