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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
ddc:530
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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2017-12-07
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, IPAC17, Meeting locationKopenhagen, Denmark, 15 May 2017 - 19 May 20172017-05-152017-05-19 Geneva : JACoW, 2596-2599 (2017) [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] ddc:540
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
ddc:540
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
; ; ; et al
Alignment, orientation, and Coulomb explosion of difluoroiodobenzene studied with the pixel imaging mass spectrometry (PImMS) camera
[arXiv:1706.08376] ddc:540
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
ddc:530
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
ddc:530
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
; ; ; et al
First Operation of a Harmonic Lasing Self-Seeded Free Electron Laser
[DESY-16-243; arXiv:1612.03635]
 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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2016-09-14
09:52
OpenAccess [PUBDB-2016-03626] Report
; ; ; et al
Empirical Optimization of Undulator Tapering at FLASH2 and Comparison with Numerical Simulations
[DESY-16-168; arXiv:1608.08108]
15 pp. (2016)
In a free-electron laser equipped with variable-gap undulator modules, the technique of undulator tapering opens up the possibility to increase the radiation power beyond the initial saturation point, thus enhancing the efficiency of the laser. The effectiveness of the enhancement relies on the proper optimization of the taper profile. [...]
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2016-08-22
16:16
OpenAccess [PUBDB-2016-03305] Journal Article
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Angle resolved photoelectron spectroscopy of two-color XUV–NIR ionization with polarization control
ddc:530
Electron emission caused by extreme ultraviolet (XUV) radiation in the presence of a strong near infrared (NIR) field leads to multiphoton interactions that depend on several parameters. Here, a comprehensive study of the influence of the angle between the polarization directions of the NIR and XUVfields on the two-color angle-resolved photoelectron spectra of He and Ne is presented. [...]
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