FS-FLASH-D

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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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2017-04-18
13:48
[PUBDB-2017-01676] Journal Article
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Photoionization of Ne Atoms and Ne$^{+}$ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections
ddc:520
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. [...]
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2017-04-12
10:21
OpenAccess [PUBDB-2017-01661] Journal Article
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Jitter-correction for IR/UV-XUV pump-probe experiments at the FLASH free-electron laser
ddc:530
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. [...]
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2017-02-21
13:22
[PUBDB-2017-01061] Poster
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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 20172017-01-262017-01-27

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2016-12-07
14:00
OpenAccess [PUBDB-2016-05994] Journal Article
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First light on 3$d$ photoionization of multiply charged xenon ions: a new photon-ion merged beam setup at PETRA III
ddc:530
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..
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2016-11-28
14:44
OpenAccess [PUBDB-2016-05682] Journal Article
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Time-resolved x-ray imaging of a laser-induced nanoplasma and its neutral residuals
ddc:530
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. [...]
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2016-11-10
14:49
OpenAccess [PUBDB-2016-04910] Journal Article
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Mapping chemical bonding of reaction intermediates with femtosecond X-ray laser spectroscopy
ddc:530
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..
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2016-11-10
10:20
OpenAccess [PUBDB-2016-04837] Journal Article
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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]  GO
ddc:530
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. [...]
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2016-10-24
11:11
OpenAccess [PUBDB-2016-04367] Contribution to a conference proceedings
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PALM Concepts and Considerations
International Beam Instrumentation Conference, IBIC2016, Meeting locationBarcelona, Spain, 11 Sep 2016 - 15 Sep 20162016-09-112016-09-15
1-4 (2016)
The accurate measurement of the arrival time of a hard x-ray free electron laser (FEL) pulse with respect to a laser is of utmost importance for pump-probe experiments proposed or carried out at FEL facilities around the world. This manuscript presents the Photon Arrival and Length Monitor (PALM), the latest device to meet this challenge, a THz streak camera, and discusses the challenges in its design, use, and analysis of results [...]
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2012-09-19
19:06
OpenAccess [PHPPUBDB-15286] Journal Article
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Characterization of a two-color pump-probe setup at FLASH using a velocity map imaging spectrometer
ddc:530
We report on the implementation of a high-count-rate charged particle imaging detector for two-color pump-probe experiments at the free electron laser in Hamburg (FLASH). In doing so, we have developed a procedure for finding the spatial and temporal overlap between the extreme UV free electron laser (FEL) pulses and the IR pulses, which allows for complete alignment of the setup in situations where the region of overlap between the FEL and the IR is not easily accessible by means of imaging optics..
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