FS-FLASH-O

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2018-11-13
16:52
[PUBDB-2018-04481] Journal Article
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Damage accumulation in thin ruthenium films induced by repetitive exposure to femtosecond XUV pulses below the single-shot ablation threshold
The process of damage accumulation in thin ruthenium films exposed to multiple femtosecond extreme ultraviolet (XUV) free-electron laser (FEL) pulses below the critical angle of reflectance at the FEL facility in Hamburg (FLASH) was experimentally analyzed. The multi-shot damage threshold is found to be lower than the single-shot damage threshold [...]
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ddc:620
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2018-11-01
16:28
OpenAccess [PUBDB-2018-04108] Journal Article
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Double-grating monochromatic beamline with ultrafast response for FLASH2 at DESY
The preliminary design of a monochromatic beamline for FLASH2 at DESY is presented. The monochromator is tunable in the 50–1000 eV energy range with resolving power higher than 1000 and temporal response below 50 fs over the whole energy range [...]
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ddc:550
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2018-11-01
16:25
[PUBDB-2018-04107] Journal Article
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A sensitive EUV Schwarzschild microscope for plasma studies with sub-micrometer resolution
We present an extreme ultraviolet (EUV) microscope using a Schwarzschild objective which is optimized for single-shot sub-micrometer imaging of laser-plasma targets. The microscope has been designed and constructed for imaging the scattering from an EUV-heated solid-density hydrogen jet [...]
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2018-11-01
16:12
OpenAccess [PUBDB-2018-04106] Journal Article
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Generation and characterization of ultrathin free-flowing liquid sheets
The physics and chemistry of liquid solutions play a central role in science, and our understanding of life on Earth. Unfortunately, key tools for interrogating aqueous systems, such as infrared and soft X-ray spectroscopy, cannot readily be applied because of strong absorption in water [...]
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ddc:500
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2018-10-25
13:52
OpenAccess [PUBDB-2018-03930] Journal Article
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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
JoVE 140, e57055 () [10.3791/57055]  GO
This protocol describes key steps in performing and analyzing femtosecond pump-probe experiments that combine a femtosecond optical laser with a free-electron laser. This includes methods to establish the spatial and temporal overlap between the optical and free-electron laser pulses during the experiment, as well as important aspects of the data analysis, such as corrections for arrival time jitter, which are necessary to obtain high-quality pump-probe data sets with the best possible temporal resolution. [...]
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ddc:570
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2018-10-19
14:18
[PUBDB-2018-03853] Journal Article
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Time gated ion microscopy of light-atom interactions
The development of ultra-short intense laser sources in the visible and extreme ultraviolet (XUV) spectral range has led to fascinating studies in laser-matter interactions and attosecond science. In the majority of these studies, the system under investigation interacts with a focused light beam, which ionizes the system [...]
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ddc:530
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2018-09-30
17:41
[PUBDB-2018-03676] Journal Article
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Phase transition lowering in dynamically compressed silicon
Nature physics xxx(xxx), xxx () [10.1038/s41567-018-0290-x]  GO
Silicon, being one of the most abundant elements in nature, attracts wide-ranging scientific and technological interest. Specifically, in its elemental form, crystals of remarkable purity can be produced. [...]
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2018-09-28
11:53
OpenAccess [PUBDB-2018-03672] Journal Article
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Mechanism of single-shot damage of Ru thin films irradiated by femtosecond extreme UV free-electron laser
Optics express 26(15), 19665 - 19685 () [10.1364/OE.26.019665]  GO
Ruthenium is a perspective material to be used for XUV mirrors at free-electron laser facilities. Yet, it is still poorly studied in the context of ultrafast laser-matter interaction. [...]
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ddc:530
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2018-09-27
10:43
OpenAccess [PUBDB-2018-03641] Journal Article
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Probing the non-equilibrium transient state in magnetite by a jitter-free two-color X-ray pump and X-ray probe experiment
Structural dynamics 5(5), 054501 () [10.1063/1.5042847]  GO
We present a general experimental concept for jitter-free pump and probe experiments at free electron lasers. By generating pump and probe pulse from one and the same X-ray pulse using an optical split-and-delay unit, we obtain a temporal resolution that is limited only by the X-ray pulse lengths. [...]
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2018-09-27
10:36
OpenAccess [PUBDB-2018-03640] Journal Article
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Signatures of autoionization in the angular electron distribution in two-photon double ionization of Ar
A kinematically complete experiment on two-photon double ionization of Ar by free-electron laser radiation with a photon energy of 27.93 eV was performed. The electron energy spectra show that double ionization is dominated by the sequential process. [...]
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ddc:530
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