FS-FLASH

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2019-01-09
12:52
OpenAccess [PUBDB-2019-00176] Journal Article
et al
Ultrafast Self-Induced X-Ray Transparency and Loss of Magnetic Diffraction
Using ultrafast $≃2.5  fs$ and $≃25  fs$ self-amplified spontaneous emission pulses of increasing intensity and a novel experimental scheme, we report the concurrent increase of stimulated emission in the forward direction and loss of out-of-beam diffraction contrast for a $Co/Pd$ multilayer sample. The experimental results are quantitatively accounted for by a statistical description of the pulses in conjunction with the optical Bloch equations [...]
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2019-01-09
11:12
OpenAccess [PUBDB-2019-00171] Journal Article
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Extreme ultraviolet probing of nonequilibrium dynamics in high energy density germanium
Intense femtosecond infrared laser pulses induce a nonequilibrium between thousands of Kelvin hot valence electrons and room-temperature ions in a germanium sample foil. The evolution of this exotic state of matter is monitored with time-resolved extreme ultraviolet absorption spectroscopy across the Ge $M_{2,3}$ edge ($≃30 eV$) using the FERMI free-electron laser [...]
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2019-01-08
09:02
Embargoed OpenAccess [PUBDB-2019-00078] Journal Article
et al
Atom-specific activation in CO oxidation
We report on atom-specific activation of CO oxidation on Ru(0001) via resonant X-ray excitation. We show that resonant 1s core-level excitation of atomically adsorbed oxygen in the co-adsorbed phase of CO and oxygen directly drives CO oxidation. [...]
Published on 2018-12-21. Available in OpenAccess from 2019-12-21.: Download fulltextPDF Download fulltextPDF (PDFA);
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2018-12-22
14:53
OpenAccess [PUBDB-2018-05889] Journal Article
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Disentangling Transient Charge Density and Metal–Ligand Covalency in Photoexcited Ferricyanide with Femtosecond Resonant Inelastic Soft X-ray Scattering
Soft X-ray spectroscopies are ideal probes of the local valence electronic structure of photocatalytically active metal sites. Here, we apply the selectivity of time-resolved resonant inelastic X-ray scattering at the iron L-edge to the transient charge distribution of an optically excited charge-transfer state in aqueous ferricyanide. [...]
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2018-11-28
16:43
OpenAccess [PUBDB-2018-04938] Poster
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Possible Upgrades of FLASH - A View from the Accelerator-Perspective
9th International Particle Accelerator Conference, IPAC'18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04  GO
Recently FLASH (Free electron LASer in Hamburg) at DESY has been granted funding for a refurbishment project covering among others the replacement of two old SRF modules, an upgrade of the injector lasers and an upgrade of parts of the electron beam diagnostics.In addition we are proposing several possible upgrades and new features for the injector and the drive linac as well as in the undulator beamlines.Here we present options which are in our opinion technically feasible and at the same time operationally manageable..
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2018-11-28
16:38
OpenAccess [PUBDB-2018-04937] Contribution to a conference proceedings
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Possible Upgrades of FLASH - A View from the Accelerator-Perspective
9th International Particle Accelerator Conference, IPAC'18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 Geneva, Switzerland : JACoW 4 pp. () [10.3204/PUBDB-2018-04937]  GO
Recently FLASH (Free electron LASer in Hamburg) at DESY has been granted funding for a refurbishment project covering among others the replacement of two old SRF modules, an upgrade of the injector lasers and an upgrade of parts of the electron beam diagnostics.In addition we are proposing several possible upgrades and new features for the injector and the drive linac as well as in the undulator beamlines.Here we present options which are in our opinion technically feasible and at the same time operationally manageable..
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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
15:53
Embargoed OpenAccess [PUBDB-2018-04105] Journal Article
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Time-resolved electron spectroscopy for chemical analysis of photodissociation: Photoelectron spectra of Fe(CO)$_5$ , Fe(CO)$_4$ , and Fe(CO)$_3$
The prototypical photoinduced dissociation of Fe(CO)$_5$ in the gas phase is used to test time-resolved x-ray photoelectron spectroscopy for studying photochemical reactions. Upon one-photon excitation at 266 nm, Fe(CO)$_5$ successively dissociates to Fe(CO)$_4$ and Fe(CO)$_3$ along a pathway where both fragments retain the singlet multiplicity of Fe(CO)$_5$. [...]
Published on 2018-07-27. Available in OpenAccess from 2019-07-27.: Download fulltextPDF Download fulltextPDF (PDFA);
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2018-11-01
15:05
OpenAccess [PUBDB-2018-04100] Book/Report/Internal Report
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Regenerative FEL amplifier at the DESY TESLA test facility as a fully coherent VUV laser
[TESLA-FEL 1997-07]
TESLA-FEL Reports 23 pp. () [10.3204/PUBDB-2018-04100]  GO
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