FS-FLASH-B

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2019-06-21
11:31
OpenAccess [PUBDB-2019-02530] Journal Article
et al
Ultrafast charge redistribution in small iodine containing molecules
We present studies on intra-molecular charge redistribution in iodine containing molecules upon iodine-4d photoionization. For this, we employed an XUV-pump-XUV-probe scheme based on time-delayed femtosecond pulses delivered by the free-electron laser at DESY in Hamburg (FLASH) [...]
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2019-05-08
09:15
OpenAccess [PUBDB-2019-02178] Journal Article
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Photon diagnostics at the FLASH THz beamline
The THz beamline at FLASH, DESY, provides both tunable (1–300 THz) narrow-bandwidth (∼10%) and broad-bandwidth intense (up to 150 uJ) THz pulses delivered in 1 MHz bursts and naturally synchronized with free-electron laser X-ray pulses. Combination of these pulses, along with the auxiliary NIR and VIS ultrashort lasers, supports a plethora of dynamic investigations in physics, material science and biology. [...]
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2019-02-20
17:27
OpenAccess [PUBDB-2019-01185] Journal Article
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Terahertz-Field-Induced Time Shifts in Atomic Photoemission
Time delays for atomic photoemission obtained in streaking or reconstruction of attosecond bursts by interference of two-photon transitions experiments originate from a combination of the quantum mechanical Wigner time and the Coulomb-laser coupling. While the former was investigated intensively theoretically as well as experimentally, the latter attracted less interest in experiments and has mostly been subject to calculations [...]
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2019-01-28
11:10
OpenAccess [PUBDB-2019-00755] Journal Article
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PhotonDiag2017 workshop: introductory overview
This issue of the Journal of Synchrotron Radiation is a special issue including papers from the PhotonDiag2017 workshop. Here, a brief introduction is given..
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2019-01-10
13:29
[PUBDB-2019-00292] Journal Article
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Selective THz control of magnetic order: new opportunities from superradiant undulator sources
Recent advancements of accelerator technology enable the generation of carrier-envelope-phase stable THz pulses with high fields at adjustable high repetition rates. The appropriate choice of THz radiator allows generation of narrow-band, spectrally dense, multicycle THz transients of tunable THz frequency which are ideally suited to selectively excite low-energy excitations such as magnons or phonons. [...]
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2018-11-15
11:09
OpenAccess [PUBDB-2018-04519] Journal Article
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Non-Linear Soft X-Ray Methods on Solids with MUSIX - the Multi-Dimensional Spectroscopy and Inelastic X-Ray Scattering Enstation
With the intense and coherent x-ray pulses available from free-electron lasers, the possibility to transfer non-linear spectroscopic methods from the laser lab to the x-ray world arises. Advantages especially regarding selectivity and thus information content as well as an improvement of signal levels are expected [...]
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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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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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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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2018-08-30
10:18
OpenAccess [PUBDB-2018-03255] Journal Article
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XUV double-pulses with femtosecond to 650 ps separation from a multilayer-mirror-based split-and-delay unit at FLASH
Extreme ultraviolet (XUV) and X-ray free-electron lasers enable new scientific opportunities. Their ultra-intense coherent femtosecond pulses give unprecedented access to the structure of undepositable nanoscale objects and to transient states of highly excited matter [...]
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