FS-FLASH-O

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2019-07-12
10:44
OpenAccess [PUBDB-2019-02698] Journal Article
et al
Evidence of Extreme Ultraviolet Superfluorescence in Xenon
We present a comprehensive experimental and theoretical study on superfluorescence in the extreme ultraviolet wavelength regime. Focusing a free-electron laser pulse in a cell filled with Xe gas, the medium is quasi-instantaneously population inverted by 4d-shell ionization on the giant resonance followed by Auger decay [...]
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2019-07-09
16:47
OpenAccess [PUBDB-2019-02678] Journal Article
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Wavefront-propagation simulations supporting the design of a time-delay compensating monochromator beamline at FLASH2
Wavefront-propagation simulations have been performed to complete the design of a monochromator beamline for FLASH2, the variable-gap undulator line at the soft X-ray free-electron laser in Hamburg (FLASH). Prior to propagation through the beamline optical elements, the parameters of the photon source were generated using the GENESIS code which includes the free-electron laser experimental data. [...]
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2019-06-21
10:30
OpenAccess [PUBDB-2019-02527] Journal Article
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Two-color XUV+NIR femtosecond photoionization of neon in the near-threshold region
Results of angle-resolved electron spectroscopy of near-threshold photoionization of Ne atoms bycombined femtosecond extreme ultraviolet and near infraredfields are presented. The dressed-electron spectra show an energetic distribution into so-called sidebands, being separated by thephoton energy of the dressing laser [...]
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2019-05-29
11:54
OpenAccess [PUBDB-2019-02388] Journal Article
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An X-ray gas monitor for free-electron lasers
A novel X-ray gas monitor (XGM) has been developed which allows the measurement of absolute photon pulse energy and photon beam position at all existing and upcoming free-electron lasers (FELs) over a broad spectral range covering vacuum ultraviolet (VUV), extreme ultraviolet (EUV) and soft and hard X-rays. The XGM covers a wide dynamic range from spontaneous undulator radiation to FEL radiation and provides a temporal resolution of better than 200 ns [...]
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2019-04-18
16:42
[PUBDB-2019-02030] Journal Article
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Reaction microscope endstation at FLASH2
A reaction microscope dedicated to multi-particle coincidence spectroscopy on gas-phase samples is installed at beamline FL26 of the free-electron laser FLASH2 in Hamburg. The main goals of the instrument are to follow the dynamics of atoms, molecules and small clusters on their natural time-scale and to study non-linear light–matter interaction with such systems. [...]
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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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2019-01-29
09:28
OpenAccess [PUBDB-2019-00839] Journal Article
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Author Correction: Generation and characterization of ultrathin free-flowing liquid sheets ist
The physics and chemistry of liquid solutions play a central role in science, and our understanding of life on Earth. Unfortunately, key tools for interrogating aqueous systems, such as infrared and soft X-ray spectroscopy, cannot readily be applied because of strong absorption in water. [...]
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2019-01-28
11:43
[PUBDB-2019-00765] Journal Article
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Hindered nematic alignment of hematite spindles in poly( N-isopropylacrylamide) hydrogels: a small-angle X-ray scattering and rheology study
Field-induced changes to the mesostructure of ferrogels consisting of spindle-shaped hematite particles and poly(N-isopropylacrylamide) are investigated by means of small-angle X-ray scattering (SAXS). Related field-induced changes to the macroscopic viscoelastic properties of these composites are probed by means of oscillatory shear experiments in an external magnetic field. [...]
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2019-01-08
10:16
OpenAccess [PUBDB-2019-00093] Journal Article
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Symmetry breakdown of electron emission in extreme ultraviolet photoionization of argon
Short wavelength free-electron lasers (FELs), providing pulses of ultrahigh photon intensity, have revolutionized spectroscopy on ionic targets. Their exceptional photon flux enables multiple photon absorptions within a single femtosecond pulse, which in turn allows for deep insights into the photoionization process itself as well as into evolving ionic states of a target [...]
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2019-01-08
09:36
Embargoed OpenAccess [PUBDB-2019-00089] Journal Article
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Auger electron angular distributions following excitation or ionization of the I 3d level in methyl iodide
Auger electron spectra following excitation or ionization of the I 3d level in CH$_3$I have been recorded with horizontally or vertically plane polarized synchrotron radiation. These spectra have enabled the Auger electron angular distributions, as characterized by the β parameter, to be determined. [...]
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