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2018-04-18
15:22
OpenAccess [PUBDB-2018-01787] Journal Article
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Multidimensional photoemission spectroscopy—the space-charge limit
Photoelectron spectroscopy, especially at pulsed sources, is ultimately limited by the Coulomb interaction in the electron cloud, changing energy and angular distribution of the photoelectrons. A detailed understanding of this phenomenon is crucial for future pump–probe photoemission studies at (x-ray) free electron lasers and high-harmonic photon sources. [...]
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2018-01-12
10:42
[PUBDB-2018-00596] Journal Article
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Short-wavelength free-electron laser sources and science: a review
This review is focused on free-electron lasers (FELs) in the hard to soft x-ray regime. The aim is to provide newcomers to the area with insights into: the basic physics of FELs, the qualities of the radiation they produce, the challenges of transmitting that radiation to end users and the diversity of current scientific applications. [...]
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2017-12-18
18:46
OpenAccess [PUBDB-2017-13675] Journal Article
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Non-invasive online wavelength measurements at FLASH2 and present benchmark
Journal of synchrotron radiation 25(1), 3 - 15 () [10.1107/S1600577517013893] special issue: "PhotonDiag2017 Workshop special issue"  GO
At FLASH2, the free-electron laser radiation wavelength is routinely measured by an online spectrometer based on photoionization of gas targets. Photoelectrons are detected with time-of-flight spectrometers and the wavelength is determined by means of well known binding energies of the target species. [...]
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2017-12-07
13:58
OpenAccess [PUBDB-2017-12869] Contribution to a conference proceedings/Contribution to a book
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Experience in Operating sFLASH With High-Gain Harmonic Generation
8th International Particle Accelerator Conference, IPAC2017, CopenhagenCopenhagen, Denmark, 14 May 2017 - 19 May 20172017-05-142017-05-19 Geneva : JACoW 2596-2599 () [10.18429/JACoW-IPAC2017-WEPAB016]  GO
sFLASH, the experimental setup for external seeding of free-electron lasers (FEL) at FLASH, has been operated in the high-gain harmonic generation (HGHG) mode. A detailed characterization of the laser-induced energy modulation, as well as the temporal characterization of the seeded FEL pulses is possible by using a transverse deflecting structure and an electron spectrometer. [...]
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2017-07-13
16:21
OpenAccess [PUBDB-2017-07579] Preprint/Report
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Alignment, Orientation, and Coulomb Explosion of Difluoroiodobenzene Studied with the Pixel Imaging Mass Spectrometry (PImMS) Camera
[arXiv:1706.08376]
() [10.1063/1.4982220]  GO
Laser-induced adiabatic alignment and mixed-field orientation of 2,6-difluoroiodobenzene (C$_6$H$_3$F$_2$I) molecules are probed by Coulomb explosion imaging following either near-infrared strong-field ionization or extreme-ultraviolet multi-photon inner-shell ionization using free-electron laser pulses. The resulting photoelectrons and fragment ions are captured by a double-sided velocity map imaging spectrometer and projected onto two position-sensitive detectors. [...]
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2017-06-14
11:03
[PUBDB-2017-04873] Journal Article
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Isomer-dependent fragmentation dynamics of inner-shell photoionized difluoroiodobenzene
The fragmentation dynamics of 2,6- and 3,5-difluoroiodobenzene after iodine 4d inner-shell photoionization with soft X-rays are studied using coincident electron and ion momentum imaging. By analyzing the momentum correlation between iodine and fluorine cations in three-fold ion coincidence events, we can distinguish the two isomers experimentally. [...]
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2017-05-10
10:10
OpenAccess [PUBDB-2017-02555] Report/Journal Article
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Alignment, orientation, and Coulomb explosion of difluoroiodobenzene studied with the pixel imaging mass spectrometry (PImMS) camera
[arXiv:1706.08376]
Laser-induced adiabatic alignment and mixed-field orientation of 2,6-difluoroiodobenzene (C$_6$H$_3$F$_2$I) molecules are probed by Coulomb explosion imaging following either near-infrared strong-field ionization or extreme-ultraviolet multi-photon inner-shell ionization using free-electron laser pulses. The resulting photoelectrons and fragment ions are captured by a double-sided velocity map imaging spectrometer and projected onto two position-sensitive detectors. [...]
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2017-04-12
10:21
OpenAccess [PUBDB-2017-01661] Journal Article
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Jitter-correction for IR/UV-XUV pump-probe experiments at the FLASH free-electron laser
In pump-probe experiments employing a free-electron laser (FEL) in combination with a synchronized optical femtosecond laser, the arrival-time jitter between the FEL pulse and the optical laser pulse often severely limits the temporal resolution that can be achieved. Here, we present a pump-probe experiment on the UV-induced dissociation of 2,6-difluoroiodobenzene $(C_{6}H_{3}F_{2}I)$ molecules performed at the FLASH FEL that takes advantage of recent upgrades of the FLASH timing and synchronization system to obtain high-quality data that are not limited by the FEL arrival-time jitter. [...]
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2017-03-16
10:09
Embargoed OpenAccess [PUBDB-2017-01389] Journal Article
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Auf der Jagd nach Quantentornados
Die hochintensiven und ultrakurzen Lichtpulse moderner Röntgenlaser erlauben es, chemische Reaktionen auf molekularer Ebene zu filmen und Beugungsbilder von Nanokristallen oder einzelnen Viren aufzunehmen, mit denen sich deren Struktur entschlüsseln lässt. Auf diese Weise ist es einer internationalen Gruppe unter Beteiligung des DESY gelungen, Schnappschüsse von Quantenstrudeln in winzigen Tröpfchen suprafluiden Heliums aufzunehmen..
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2016-12-21
12:01
OpenAccess [PUBDB-2016-06533] Preprint/Report
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First Operation of a Harmonic Lasing Self-Seeded Free Electron Laser
[DESY-16-243; arXiv:1612.03635]
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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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