308 citations · 780 across the 18 of their papers we have counts for
18 papers
Optimizing a Superconducting Radiofrequency Gun Using Deep Reinforcement Learning
David Meier, Luis Vera Ramirez, Jens Völker +3
Superconducting photoelectron injectors are a promising technique for generating high brilliant pulsed electron beams with high repetition rates and low emittances. Experiments suc…
Artificial intelligence for online characterization of ultrashort X-ray free-electron laser pulses
Kristina Dingel, Thorsten Otto, Lutz Marder +11
X-ray free-electron lasers (XFELs) as the world's brightest light sources provide ultrashort X-ray pulses with a duration typically in the order of femtoseconds. Recently, they hav…
Electronic Quantum Coherence in Glycine Molecules Probed with Ultrashort X-ray Pulses in Real Time
David Schwickert, Marco Ruberti, Přemys Kolorenč +25
Quantum coherence between electronic states of a photoionized molecule and the resulting process of ultrafast electron-hole migration have been put forward as a possible quantum me…
Measurement of spin dynamics in a layered nickelate using x-ray photon correlation spectroscopy: Evidence for intrinsic destabilization of incommensurate stripes at low temperatures
Alessandro Ricci, Nicola Poccia, Gaetano Campi +15
We study the temporal stability of stripe-type spin order in a layered nickelate with X-ray photon correlation spectroscopy and observe fluctuations on time scales of tens of minut…
Direct Visualization of Spatial inhomogeneity of Spin Stripes Order in La1.72Sr0.28NiO4
Gaetano Campi, Nicola Poccia, Boby Joseph +14
In several strongly correlated electron systems, defects, charge and local lattice distortions are found to show complex inhomogeneous spatial distributions. There is growing evide…
Photoionization of metastable heliumlike C4+(1s 2s 3S1) ions: Precision study of intermediate doubly excited states
A. Müller, E. Lindroth, S. Bari +10
In a joint experimental and theoretical endeavour, photoionization of metastable C4+(1s 2s 3S1) ions via intermediate levels with hollow, double-K-vacancy configurations 2s2p, 2s3p…
Near-K-edge single, double, and triple photoionization of C+ ions
A. Müller, A. Borovik, T. Buhr +8
Single, double, and triple ionization of the C+ ion by a single photon have been investigated in the energy range 286 to 326 eV around the K-shell single-ionization threshold at an…
Photophysics of indole upon x-ray absorption
Thomas Kierspel, Cédric Bomme, Michele Di Fraia +11
A photofragmentation study of gas-phase indole (CHN) upon single-photon ionization at a photon energy of 420 eV is presented. Indole was primarily inner-shell ionized at it…
Imaging the square of the correlated two-electron wave function of a hydrogen molecule
M. Waitz, R. Y. Bello, D. Metz +21
The toolbox for imaging molecules is well-equipped today. Some techniques visualize the geometrical structure, others the electron density or electron orbitals. Molecules are many-…
Near L-Edge Single and Multiple Photoionization of Singly Charged Iron Ions
Stefan Schippers, Michael Martins, Randolf Beerwerth +7
Absolute cross sections for m-fold photoionization (m=1,...,6) of Fe+ by a single photon were measured employing the photon-ion merged-beams setup PIPE at the PETRA III synchrotron…
Field-free deterministic ultra fast creation of skyrmions by spin orbit torques
Felix Büttner, Ivan Lemesh, Michael Schneider +10
Magnetic skyrmions are currently the most promising option to realize current-driven magnetic shift registers. A variety of concepts to create skyrmions were proposed and demonstra…
High-dynamic-range water window ptychography
Max Rose, Dmitry Dzhigaev, Tobias Senkbeil +8
Ptychographic imaging with soft X-rays, especially in the water window energy range, suffers from limited detector dynamic range that directly influences the maximum spatial resolu…
Prominent role of multi-electron processes in K-shell double and triple photodetachment of oxygen anions
S. Schippers, R. Beerwerth, L. Abrok +7
The photon-ion merged-beams technique was used at a synchrotron light source for measuring absolute cross sections of double and triple photodetachment of O ions. The experim…
Two-particle interference of electron pairs on a molecular level
M. Waitz, D. Metz, J. Lower +19
We investigate the photo-doubleionization of molecules with 400 eV photons. We find that the emitted electrons do not show any sign of two-center interference fringes in thei…
Water Window Ptychographic Imaging with Characterized Coherent X-rays
Max Rose, Petr Skopintsev, Dmitry Dzhigaev +8
We report on a ptychographical coherent diffractive imaging experiment in the water window with focused soft X-rays at . An X-ray beam with high degree of coherenc…
Imaging Molecular Structure through Femtosecond Photoelectron Diffraction on Aligned and Oriented Gas-Phase Molecules
R. Boll, A. Rouzee, M. Adolph +49
This paper gives an account of our progress towards performing femtosecond time-resolved photoelectron diffraction on gas-phase molecules in a pump-probe setup combining optical la…
Absolute cross sections for photoionization of Xe ions (1 q 5) at the 3d ionization threshold
S. Schippers, S. Ricz, T. Buhr +26
The photon-ion merged-beams technique has been employed at the new Photon-Ion spectrometer at PETRA III (PIPE) for measuring multiple photoionization of Xe (q=1-5) ions. Tot…
Characterization of Spatial Coherence of Synchrotron Radiation with Non-Redundant Arrays of Apertures
P. Skopintsev, A. Singer, J. Bach +16
We present a method to characterize the spatial coherence of soft X-ray radiation from a single diffraction pattern. The technique is based on scattering from non-redundant arrays…