FS-FLASH

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2017-02-22
10:40
OpenAccess [PUBDB-2017-01078] Journal Article
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First Operation of a Harmonic Lasing Self-Seeded Free Electron Laser
ddc:530
Harmonic lasing is a possible mode of operation of X-ray FEL user facilities that allows us to provide brilliant beams of higher energy photons for user experiments. Another useful application of harmonic lasing is the so-called harmonic lasing self-seeded free electron laser (HLSS FEL) that allows the improvement of spectral brightness of these facilities. [...]
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2016-12-12
09:36
OpenAccess [PUBDB-2016-06076] Journal Article
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Anti-Stokes resonant x-ray Raman scattering for atom specific and excited state selective dynamics
ddc:530
Ultrafast electronic and structural dynamics of matter govern rate and selectivity of chemical reactions, as well as phase transitions and efficient switching in functional materials. Since x-rays determine electronic and structural properties with elemental, chemical, orbital and magnetic selectivity, short pulse x-ray sources have become central enablers of ultrafast science. [...]
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2016-12-05
14:21
Embargoed OpenAccess [PUBDB-2016-05879] Journal Article
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Chemical Bond Activation Observed with an X-ray Laser
ddc:530
The concept of bonding and antibonding orbitals is fundamental in chemistry. The population of those orbitals and the energetic difference between the two reflect the strength of the bonding interaction. [...]
Published on 2016-09-01. Available in OpenAccess from 2017-09-01.: Download fulltextPDF;

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2016-11-10
14:14
Embargoed OpenAccess [PUBDB-2016-04896] Journal Article
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Orbital-specific mapping of the ligand exchange dynamics of $Fe(CO)_{5}$ in solution
ddc:070
Transition-metal complexes have long attracted interest for fundamental chemical reactivity studies and possible use in solar energy conversion1, 2. Electronic excitation, ligand loss from the metal centre, or a combination of both, creates changes in charge and spin density at the metal site3, 4, 5, 6, 7, 8, 9, 10, 11 that need to be controlled to optimize complexes for photocatalytic hydrogen production8 and selective carbon–hydrogen bond activation9, 10, 11. [...]
Published on 2015-04-01. Available in OpenAccess from 2015-10-01.: Download fulltextPDF; Restricted: Download fulltextPDF Download fulltextPDF (PDFA);

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2016-11-10
12:12
OpenAccess [PUBDB-2016-04869] Journal Article
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Identification of the dominant photochemical pathways and mechanistic insights to the ultrafast ligand exchange of Fe(CO)$_{5}$ to Fe(CO)$_{4}$EtOH
ddc:530
We utilized femtosecond time-resolved resonant inelastic X-ray scattering and ab initio theory to study the transient electronic structure and the photoinduced molecular dynamics of a model metal carbonyl photocatalyst Fe(CO)$_5$ in ethanol solution. We propose mechanistic explanation for the parallel ultrafast intra-molecular spin crossover and ligation of the Fe(CO)$_4$ which are observed following a charge transfer photoexcitation of Fe(CO)$_5$ as reported in our previous study [Wernet et al., Nature 520, 78 (2015)]. [...]
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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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2016-05-09
11:16
Embargoed OpenAccess [PUBDB-2016-01890] Journal Article
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New experimental perspectives for soft x-ray absorption spectroscopies at ultra-low temperatures below 50 mK and in high magnetic fields up to 7 T
ddc:530
A new ultra-low temperature experiment including a superconducting vector magnet has been developed for soft x-ray absorption spectroscopy experiments at third generation synchrotron light sources. The sample is cooled below 50 mK by a cryogen free 3He-4He dilution refrigerator. [...]
Published on 2016-04-29. Available in OpenAccess from 2017-04-29.: Download fulltextPDF Download fulltextPDF (PDFA);

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2016-01-14
11:34
[PUBDB-2016-00292] Journal Article
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Correction of the deterministic part of space–charge interaction in momentum microscopy of charged particles
ddc:570
Ultrahigh spectral brightness femtosecond XUV and X-ray sources like free electron lasers (FEL) and table-top high harmonics sources (HHG) offer fascinating experimental possibilities for analysis of transient states and ultrafast electron dynamics. For electron spectroscopy experiments using illumination from such sources, the ultrashort high-charge electron bunches experience strong space–charge interactions. [...]

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2016-01-14
11:29
OpenAccess [PUBDB-2016-00290] Journal Article
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Optical laser-induced CO desorption from Ru(0001) monitored with a free-electron X-ray laser: DFT prediction and X-ray confirmation of a precursor state
ddc:540
We present density functional theory modeling of time-resolved optical pump/X-ray spectroscopic probe data of CO desorption from Ru(0001). The BEEF van der Waals functional predicts a weakly bound state as a precursor to desorption. [...]
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2016-01-14
11:25
OpenAccess [PUBDB-2016-00286] Journal Article
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Strong Influence of Coadsorbate Interaction on CO Desorption Dynamics on Ru(0001) Probed by Ultrafast X-Ray Spectroscopy and Ab Initio Simulations
ddc:550
We show that coadsorbed oxygen atoms have a dramatic influence on the CO desorption dynamics from Ru(0001). In contrast to the precursor-mediated desorption mechanism on Ru(0001), the presence of surface oxygen modifies the electronic structure of Ru atoms such that CO desorption occurs predominantly via the direct pathway. [...]
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