FS-FLASH-O

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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. [...]
Published on 2018-09-06. Available in OpenAccess from 2019-09-06.: Download fulltextPDF Download fulltextPDF (PDFA);
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2019-01-08
09:34
Embargoed OpenAccess [PUBDB-2019-00088] Journal Article
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Photoionization of the iodine 3d, 4s, and 4p orbitals in methyl iodide
Ionization of the I 3d, 4s, and 4p orbitals in methyl iodide (CH$_3$I) has been studied by using synchrotron radiation to measure the total ion yield and by recording photoelectron spectra with linearly polarized radiation in two polarization orientations. The complete photoelectron spectrum of CH3I has been recorded at several photon energies, and bands due to the C 1s, I 3d, 4s, 4p, and 4d atomic-like orbitals, as well as the molecular orbitals, have been observed and assigned. [...]
Published on 2018-10-08. Available in OpenAccess from 2019-10-08.: Download fulltextPDF Download fulltextPDF (PDFA);
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2018-12-01
20:24
Embargoed OpenAccess [PUBDB-2018-05141] Journal Article
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Coulomb explosion imaging of $CH_{3}I$ and $C_{2}ClI$ photodissociation dynamics
The photodissociation dynamics of CH$_3$I and CH$_2$ClI at 272 nm were investigated by time-resolved Coulomb explosion imaging, with an intense non-resonant 815 nm probe pulse. Fragment ion momenta over a wide m/z range were recorded simultaneously by coupling a velocity map imaging spectrometer with a pixel imaging mass spectrometry camera. [...]
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2018-11-28
16:30
OpenAccess [PUBDB-2018-04936] Poster
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Status of the Superconducting Soft X-ray Free-Electron Laser FLASH at DESY
9th International Particle Accelerator Conference, IPAC'18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04  GO
FLASH, the free-electron laser (FEL) user facility at DESY, deliverers high brilliance XUV and soft x-ray FEL radiation for photon experiments since summer 2005.In 2014 and 2015 a second beamline, FLASH2, has been commissioned in parallel to user operation at FLASH1.FLASH's superconducting linac can produce bunch trains of up to 800 bunches within a 0.8 ms RF flat top at a repetition rate of 10 Hz.In standard operation during 2017 FLASH supplied up to 500 bunches in two bunch trains with independent fill patterns and compression schemes.Since mid 2017 initial commissioning of a third experimental beamline, accommodating the FLASHForward plasma wakefield acceleration experiment, has started.We report on the highlights of the FLASH operation in 2017/2018..
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2018-11-28
16:23
OpenAccess [PUBDB-2018-04935] Contribution to a conference proceedings
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Status of the Superconducting Soft X-ray Free-Electron Laser FLASH at DESY
9th International Particle Accelerator Conference, IPAC'18, VancouverVancouver, Canada, 29 Apr 2018 - 4 May 20182018-04-292018-05-04 4 pp. () [10.3204/PUBDB-2018-04935]  GO
FLASH, the free-electron laser (FEL) user facility at DESY, deliverers high brilliance XUV and soft x-ray FEL radiation for photon experiments since summer 2005.In 2014 and 2015 a second beamline, FLASH2, has been commissioned in parallel to user operation at FLASH1.FLASH's superconducting linac can produce bunch trains of up to 800 bunches within a 0.8 ms RF flat top at a repetition rate of 10 Hz.In standard operation during 2017 FLASH supplied up to 500 bunches in two bunch trains with independent fill patterns and compression schemes.Since mid 2017 initial commissioning of a third experimental beamline, accommodating the FLASHForward plasma wakefield acceleration experiment, has started.We report on the highlights of the FLASH operation in 2017/2018..
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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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