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2019-07-12
10:44
OpenAccess [PUBDB-2019-02698] Journal Article
et al
Evidence of Extreme Ultraviolet Superfluorescence in Xenon
We present a comprehensive experimental and theoretical study on superfluorescence in the extreme ultraviolet wavelength regime. Focusing a free-electron laser pulse in a cell filled with Xe gas, the medium is quasi-instantaneously population inverted by 4d-shell ionization on the giant resonance followed by Auger decay [...]
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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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2019-06-03
21:21
OpenAccess [PUBDB-2019-02410] Journal Article
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Photoionization and photofragmentation of singly charged positive and negative Sc$_3$N@C$_{80}$ endohedral fullerene ions
Photoprocesses of the endohedral fullerene ions Sc$_3$N@C$_{80}^+$ and Sc$_3$N@C$_{80}^-$ in the gas phase have been investigated in the photon energy ranges 30--50 eV and 280--420 eV. Single and double ionization as well as single ionization accompanied by the release of a C$_2$ dimer were observed as a function of the photon energy for the positive parent ion and double detachment was measured for the negative parent ion. [...]
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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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2019-01-28
14:04
OpenAccess [PUBDB-2019-00798] Bachelor Thesis

Analyse und Optimierung der Schwingungseigenschaften der Experimentierumgebung am Teilchenbeschleuniger Petra III
73 pp. () [10.3204/PUBDB-2019-00798] = Bachelorarbeit, HAW Hamburg, 2018  GO
Diese Bachelorthesis umfasst eine Schwingungsanalyse der Wände der Opticalund Experimental Hutches am PETRA III. Die vorhandenen Schwingungen in denHutches werden gemessen und auf Amplituden und Frequenzen analysiert. [...]
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2018-12-22
14:53
OpenAccess [PUBDB-2018-05889] Journal Article
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Disentangling Transient Charge Density and Metal–Ligand Covalency in Photoexcited Ferricyanide with Femtosecond Resonant Inelastic Soft X-ray Scattering
Soft X-ray spectroscopies are ideal probes of the local valence electronic structure of photocatalytically active metal sites. Here, we apply the selectivity of time-resolved resonant inelastic X-ray scattering at the iron L-edge to the transient charge distribution of an optically excited charge-transfer state in aqueous ferricyanide. [...]
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2018-12-22
13:31
OpenAccess [PUBDB-2018-05887] Journal Article
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Near-Edge Soft X-ray Absorption Mass Spectrometry of Protonated Melittin
We have investigated the photoionization and photofragmentation yields of gas-phase multiply protonated melittin cations for photon energies at the K-shell absorption edges of carbon,nitrogen, and oxygen. Two similar experimental approaches were employed [...]
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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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2018-10-14
14:42
OpenAccess [PUBDB-2018-03783] Journal Article
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Photoionization of metastable heliumlike $C^{4+}$($1s\,2s\; ^3S_ 1)$ ions: Precision study of intermediate doubly excited states
In a joint experimental and theoretical endeavor, photoionization of metastable $C^{4+}$($1s\,2s\; ^3S_ 1)$ ions via intermediate levels with hollow, double-K-vacancy configurations $2s2p, 2s3p, 2p3s, 2p3d, 2s4p, 2p4s$, and $2p4d$ has been investigated. High-resolution photon-ion merged-beams measurements were carried out with the resolving power reaching up to 25 800 which is sufficient to separate the leading fine-structure components of the $2s2p^{3}P$ term. [...]
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2018-10-14
14:32
OpenAccess [PUBDB-2018-03782] Poster
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PIPE: The Photon-Ion-Endstation at PETRA III for Experimental Studies of XUV-Photoprocesses in Small Quantum Systems
Deutsche Tagung für Forschung mit Synchrotronstrahlung, Neutronen und Ionenstrahlen an Großgeräten, SNI 2018, GarchingGarching, Germany, 17 Sep 2018 - 19 Sep 20182018-09-172018-09-19  GO
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