FS-FLASH

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2017-09-13
16:13
OpenAccess [PUBDB-2017-10736] Contribution to a conference proceedings/Contribution to a book
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Concept for a Seeded FEL at FLASH2
8th Intl. Particle Accelerator Conference, IPAC2017, Meeting locationCopenhagen, Denmark, 14 May 2017 - 19 May 20172017-05-142017-05-19
Geneva : JACoW, 2607-2610 (2017) [10.18429/JACoW-IPAC2017-WEPAB019]  GO
The free-electron laser (FEL) FLASH is a user facility delivering photon pulses down to 4 nm wavelength. Recently, the second FEL undulator beamline FLASH2 was added to the facility. [...]
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2017-09-12
14:07
Embargoed OpenAccess [PUBDB-2017-10683] Journal Article
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Real-Time Elucidation of Catalytic Pathways in CO Hydrogenation on Ru
ddc:530
The direct elucidation of the reaction pathways in heterogeneous catalysis has been challenging due to the short-lived nature of reaction intermediates. Here, we directly measured on ultrafast time scales the initial hydrogenation steps of adsorbed CO on a Ru catalyst surface, which is known as the bottleneck reaction in syngas and CO$_2$ reforming processes. [...]
Published on 2017-07-31. Available in OpenAccess from 2018-07-31.: CO Hydrogenation Supplemental 2017.07.28 - Resubmitted JPCL - Download fulltextPDF Download fulltextPDF (PDFA); CO Hydrogenation 2017.07.30 - Resubmitted JPCL - Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);

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2017-09-04
23:48
[PUBDB-2017-10311] Journal Article
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Direct 3D mapping of the Fermi surface and Fermi velocity
Nature materials 16(6), 615 - 621 (2017) [10.1038/nmat4875]  GO
ddc:610
We performed a full mapping of the bulk electronic structure including the Fermi surface and Fermi-velocity distribution v$_F$(k$_F$) of tungsten. The 4D spectral function ρ(E$_B$; k) in the entire bulk Brillouin zone and 6 eV binding-energy (E$_B$) interval was acquired in ~3 h thanks to a new multidimensional photoemission data-recording technique (combining full-field k-microscopy with time-of-flight parallel energy recording) and the high brilliance of the soft X-rays used [...]
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2017-08-30
13:56
OpenAccess [PUBDB-2017-10147] Contribution to a conference proceedings/Contribution to a book
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First Operation of a Harmonic Lasing Self-Seeded FEL
8th International Particle Accelerator Conference, IPAC17, Meeting locationCopenhagen, Denmark, 15 May 2017 - 19 May 20172017-05-152017-05-19
Geneva : JACoW, 2621-2624 (2017) [10.18429/JACoW-IPAC2017-WEPAB023]  GO
Harmonic lasing is a perspective mode of operation of X-ray FEL user facilities that allows to provide brilliant beams of higher energy photons for user experiments. Another useful application of harmonic lasing is so called Harmonic Lasing Self-Seeded Free Electron Laser (HLSS FEL) that allows to improve spectral brightness of these facilities. [...]
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2017-06-23
10:06
OpenAccess [PUBDB-2017-05924] Journal Article
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Statistical properties of a free-electron laser revealed by Hanbury Brown?Twiss interferometry
ddc:530
We present a comprehensive experimental analysis of statistical properties of the self-amplified spontaneous emission free-electron laser (FEL) FLASH by means of Hanbury Brown and Twiss interferometry. The experiments were performed at FEL wavelengths of 5.5, 13.4, and 20.8 nm [...]
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2017-06-08
17:06
OpenAccess [PUBDB-2017-04558] Journal Article
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Communication: Direct evidence for sequential dissociation of gas-phase Fe(CO)$_5$ via a singlet pathway upon excitation at 266 nm
ddc:540
We prove the hitherto hypothesized sequential dissociation of Fe(CO)$_5$ in the gas phase upon photoexcitation at 266 nm via a singlet pathway with time-resolved valence and core-level photoelectron spectroscopy with an x-ray free-electron laser. Valence photoelectron spectra are used to identify free CO molecules and to determine the time constants of stepwise dissociation to Fe(CO)$_4$ within the temporal resolution of the experiment and further to Fe(CO)$_3$ within 3 ps [...]
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2017-05-04
15:03
OpenAccess [PUBDB-2017-02270] Journal Article
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Catalysis in real time using X-ray lasers
ddc:540
We describe how the unique temporal and spectral characteristics of X-ray free-electron lasers (XFEL) can be utilized to follow chemical transformations in heterogeneous catalysis in real time. We highlight the systematic study of CO oxidation on Ru(0 0 0 1), which we initiate either using a femtosecond pulse from an optical laser or by activating only the oxygen atoms using a THz pulse [...]
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2017-02-22
10:40
OpenAccess [PUBDB-2017-01078] Journal Article
; ; ; et al
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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