CFEL-UDSS

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2019-07-09
17:13
OpenAccess [PUBDB-2019-02681] Journal Article
et al
Surface structure determination by x-ray standing waves at a free-electron laser
We demonstrate the structural sensitivity and accuracy of the x-ray standing wave technique at a high repetition rate free-electron laser, FLASH at DESY in Hamburg, by measuring the photoelectron yield from the surface SiO$_2$ of Mo/Si multilayers. These experiments open up the possibility to obtain unprecedented structural information of adsorbate and surface atoms with picometer spatial and femtosecond temporal resolution [...]
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ddc:530
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2019-07-04
18:33
OpenAccess [PUBDB-2019-02655] Journal Article
et al
Inner-shell X-ray absorption spectra of the cationic series $\mathrm{NH_y^+ ( y = 0–3)}$
Ion yields following X-ray absorption of the cationic series $\mathrm{NH_y^+ ( y = 0–3)}$ were measured to identify the characteristic absorption resonances in the energy range of the atomic nitrogen K-edge. Significant changes in the position of the absorption resonances were observed depending on the number of hydrogen atoms bound to the central nitrogen atom. [...]
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ddc:540
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2019-06-21
11:31
OpenAccess [PUBDB-2019-02530] Journal Article
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Ultrafast charge redistribution in small iodine containing molecules
We present studies on intra-molecular charge redistribution in iodine containing molecules upon iodine-4d photoionization. For this, we employed an XUV-pump-XUV-probe scheme based on time-delayed femtosecond pulses delivered by the free-electron laser at DESY in Hamburg (FLASH) [...]
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ddc:530
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2019-05-26
07:50
[PUBDB-2019-02368] Journal Article
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The photon‐ion merged‐beams experiment PIPE at PETRA III—The first five years
X-ray spectrometry XXX, xrs.3035 () [10.1002/xrs.3035]  GO
The Photon-Ion Spectrometer at PETRAIII—in short, PIPE—is a permanentlyinstalled user facility at the "Variable Polarization XUV Beamline" P04 of thesynchrotron light source PETRA III operated by DESY in Hamburg, Germany.The careful design of the PIPE ion-optics in combination with the record-highphoton flux at P04 has lead to a breakthrough in experimental studies ofphoton interactions with ionized small quantum systems. This short reviewprovides an overview over the published scientific results from photon-ionmerged-beams experiments at PIPE that were obtained since the start of P04operations in 2013. [...]
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ddc:530
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2019-04-10
13:20
[PUBDB-2019-01919] Journal Article
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Light Source Upgrades at DESY: PETRA IV and FLASH2020+
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2019-02-27
14:52
OpenAccess [PUBDB-2019-01266] Journal Article/Contribution to a conference proceedings
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XMCD going ultra-cold: Experiments at 100 mK and 7 T
XXX International Conference on Photonic, Electronic, and Atomic Collisions, ICPEAC30, CairnsCairns, Australia, 26 Jul 2017 - 1 Aug 20172017-07-262017-08-01 Journal of physics / Conference Series Conference Series 875, 112005 () [10.1088/1742-6596/875/12/112005]  GO
First experiments along with the general capabilities of the TTXMCD endstation at P04, PETRA III, DESY are presented. The TTXMCD endstation allows measuring the magnetic properties of solids, thin films, molecules or atomic adsorbates at ultra-cold temperatures in an element specific way [...]
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2019-01-09
13:33
OpenAccess [PUBDB-2019-00192] Journal Article
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Towards the geometric structure of small supported $Au_{9}$ clusters on Si
Ultra-small clusters containing few atoms are of high interest in both fundamental research and applications due to their specific functional, magnetic or chemical properties which depend on size and composition. The experimental results of the morphology of the size-selected clusters, consisting of few atoms can be an ideal benchmark for sophisticated theoretical models [...]
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ddc:600
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2019-01-07
16:59
Embargoed OpenAccess [PUBDB-2019-00069] Journal Article
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The LAMP instrument at the Linac Coherent Light Source free-electron laser
The Laser Applications in Materials Processing (LAMP) instrument is a new end-station for soft X-ray imaging, high-field physics, and ultrafast X-ray science experiments that is available to users at the Linac Coherent Light Source (LCLS) free-electron laser. While the instrument resides in the Atomic, Molecular and Optical science hutch, its components can be used at any LCLS beamline. [...]
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ddc:620
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2018-11-07
16:12
OpenAccess [PUBDB-2018-04297] Conference Presentation
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Towards Chirp Control of XUV Free Electron Lasers
8th EPS-QEOD EUROPHOTON CONFERENCE, BarcelonaBarcelona, Spain, 2 Sep 2018 - 7 Sep 20182018-09-022018-09-07  GO
We use 267nm femtosecond laser pulses to modulate electrons of a XUV free electron laser. By changing the chirp of this laser pulses we can influence the chirp of the generated XUV FEL pulses, which are characterized by THz streaking. [...]
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2018-10-30
15:47
OpenAccess [PUBDB-2018-04069] Book/Report/Internal Report

Field accuracy requirements for the undulator systems of the X-ray FELs at TESLA
[DESY-TESLA-FEL-2000-14]
TESLA-FEL Reports 11 pp. () [10.3204/PUBDB-2018-04069]  GO
In SASE FELs, the radiation power has to saturate in a single pass through the undulator. In the VUV and X-rayregime, with undulators ranging in length from several tens to hunderds of meters, even a few percent increase ingain length could mean a lengthening of the undulator by several meters. [...]
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