FS-FL

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2017-07-13
16:21
OpenAccess [PUBDB-2017-07579] Preprint/Report
; ; ; 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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2017-06-14
11:03
[PUBDB-2017-04873] Journal Article
; ; ; et al
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
; ; ; et al
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
[PUBDB-2017-01389] Journal Article
; ;
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
; ; ; et al
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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2016-08-10
13:50
OpenAccess [PUBDB-2016-02922] Journal Article
; ; ; et al
Simultaneous Operation of Two Soft X-Ray Free-Electron Lasers Driven by One Linear Accelerator
ddc:530
Extreme-ultraviolet to x-ray free-electron lasers (FELs) in operation for scientific applications are up to now single-user facilities. While most FELs generate around 100 photon pulses per second, FLASH at DESY can deliver almost two orders of magnitude more pulses in this time span due to its superconducting accelerator technology. [...]
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2016-08-10
13:36
[PUBDB-2016-02918] Journal Article
; ; ; et al
Free-Electron Laser Multiplex Driven by a Superconducting Linear Accelerator
ddc:540
Free-electron lasers (FELs) generate femtosecond XUV and X-ray pulses at peak powers in the gigawatt range. The FEL user facility FLASH at DESY (Hamburg, Germany) is driven by a superconducting linear accelerator with up to 8000 pulses per second. [...]
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