FS-CFEL-3

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2019-09-24
11:25
[PUBDB-2019-03439] Journal Article
et al
Femtosecond-resolved observation of the fragmentation of buckminsterfullerene following X-ray multiphoton ionization
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2019-09-03
10:01
Embargoed OpenAccess [PUBDB-2019-03189] Journal Article

Kinetic isotope effects in the water forming reaction $\mathrm{H_{2} /D_{2} +}$ OH from rigorous close-coupling quantum dynamics simulations
Thermal rate constants and kinetic isotope effects (KIE) for the prototypical water-forming $\mathrm{D_2 + OH → D + DHO}$ reaction are calculated for temperatures between 150 K and 1000 K using rigorous quantum dynamics simulations including all degrees of freedom. Very good comparison with experimental results is found for the thermal rate constants and overall good comparison with experimental KIE is obtained. [...]
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ddc:540
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2019-08-29
16:44
[PUBDB-2019-03151] Conference Presentation
et al
Ultrafast Demagnetization by Extreme Ultraviolet Light
Joint Magnetism and Magnetic Materials-INTERMAG Conference 2019, Washington, D.C.Washington, D.C., USA, 13 Jan 2019 - 18 Jan 20192019-01-132019-01-18

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2019-08-26
14:15
[PUBDB-2019-03117] Journal Article

Ultrafast Charge Transfer and Structural Dynamics Following Outer-Valence Ionization of a Halogen-Bonded Dimer
We study the temporal evolution of the CH$_2$O···ClF halogen-bonded dimer following vertical ionization out of outer-valence molecular orbitals on a femtosecond time scale, employing mixed quantum-classical molecular dynamics simulations. The charge density pattern in the ground state that is suitable for the formation of the ground-state halogen bond can be changed upon ionization. [...]
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2019-08-07
09:21
OpenAccess [PUBDB-2019-02925] Journal Article
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Detecting coherent core-hole wave-packet dynamics in N$_2$ by time- and angle-resolved inner-shell photoelectron spectroscopy
We propose an imaging technique to follow core-hole wave-packet oscillations in the nitrogen molecule. In this scheme, an attosecond x-ray pulse core-ionizes the nitrogen molecule and a subsequent attosecond x-ray pulse probes the evolution of the electron dynamics. [...]
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2019-07-24
11:15
OpenAccess [PUBDB-2019-02799] Journal Article
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Hole dynamics in a photovoltaic donor-acceptor couple revealed by simulated time-resolved X-ray absorption spectroscopy
Structural dynamics 6(4), 044102 () [10.1063/1.5097653]  GO
Theoretical and experimental methodologies that can characterize electronic and nuclear dynamics, and the coupling between the two, are needed to understand photoinduced charge transfer in molecular building blocks used in organic photovoltaics. Ongoing developments in ultrafast pump-probe techniques such as time-resolved X-ray absorption spectroscopy, using an X-ray free electron laser in combination with an ultraviolet femtosecond laser, present desirable probes of coupled electronic and nuclear dynamics [...]
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2019-07-04
12:46
OpenAccess [PUBDB-2019-02638] Journal Article
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Theoretical evidence for the sensitivity of charge-rearrangement-enhanced x-ray ionization to molecular size
It was recently discovered that molecular ionization at high x-ray intensity is enhanced, in comparison with that of isolated atoms, through a phenomenon called CREXIM (charge-rearrangement-enhanced x-ray ionization of molecules). X-ray absorption selectively ionizes heavy atoms within molecules, triggering electron transfer from neighboring atoms to the heavy-atom sites and enabling further ionization there [...]
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2019-06-13
09:08
OpenAccess [PUBDB-2019-02472] Journal Article
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Ultrafast anisotropic disordering in graphite driven by intense hard X-ray pulses
We present results from the SPring-8 Angstrom Compact free electron LAser (SACLA) X-ray free electron laser (XFEL) facility, using an X-ray pump, X-ray probe scheme to observe ultrafast changes in the structure of heated graphite. The 9.8 keV XFEL beam was focused to give an intensity on the order of  ∼ 10$^{19}$ W/cm$^2$, and the evolution of the diffraction pattern observed up to delays of 300 fs [...]
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2019-06-12
14:56
OpenAccess [PUBDB-2019-02460] Journal Article
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xcalib : a focal spot calibrator for intense X-ray free-electron laser pulses based on the charge state distributions of light atoms
The xcalib toolkit has been developed to calibrate the beam profile of an X-ray free-electron laser (XFEL) at the focal spot based on the experimental charge state distributions (CSDs) of light atoms. Characterization of the fluence distribution at the focal spot is essential to perform the volume integrations of physical quantities for a quantitative comparison between theoretical and experimental results, especially for fluence-dependent quantities. [...]
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2019-04-09
10:50
OpenAccess [PUBDB-2019-01910] Preprint/Report
et al
Scientific Opportunities with an X-ray Free-Electron Laser Oscillator
[arXiv:1903.09317]
 GO
An X-ray free-electron laser oscillator (XFELO) is a new type of hard X-ray source that would produce fully coherent pulses with meV bandwidth and stable intensity. The XFELO complements existing sources based on self-amplified spontaneous emission (SASE) from high-gain X-ray free-electron lasers (XFEL) that produce ultra-short pulses with broad-band chaotic spectra [...]
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