240 citations · 594 across the 22 of their papers we have counts for
24 papers
X-ray Driven Trihydrogen Formation on Silica Nanosurfaces
Samuel Sahel-Schackis, Adam Summers, Ritika Dagar +29
The trihydrogen cation () initiates the ion-molecule reactions that build molecular complexity in interstellar space. Whether its canonical formation reaction, $\ma…
Dichography: Two-frame Ultrafast Imaging from a Single Diffraction Pattern
Linos Hecht, Andre Al Haddad, Björn Bastian +47
We experimentally demonstrate that pairs of time-delayed ultrabright and ultrashort X-ray pulses of two different colors, delivered by modern X-ray Free Electron Lasers, can provid…
Model-free pattern separation of two-color ultrafast X-ray diffraction
Linos Hecht, Yevheniy Ovcharenko, Asbjørn Ø. Lægdsmand +28
Two-color X-ray imaging with Free Electron Laser pulses offers a powerful approach for probing ultrafast structural dynamics in nanoscale systems, combining (near-)atomic spatial r…
Unraveling the relaxation dynamics of Uracil: insights from time-resolved X-ray photoelectron spectroscopy
Davide Faccialà, Matteo Bonanomi, Bruno Nunes Cabral Tenorio +26
We report a study of the electronic and nuclear relaxation dynamics of the photoexcited RNA base uracil in the gas phase, using time-resolved core level photoelectron spectroscopy…
SPRING: an effective and reliable framework for image reconstruction in single-particle Coherent Diffraction Imaging
Alessandro Colombo, Mario Sauppe, Andre Al Haddad +40
Coherent Diffraction Imaging (CDI) is an experimental technique to gain images of isolated structures by recording the light scattered off the sample. In principle, the sample dens…
Transmission spectroscopy of CF molecules in intense x-ray fields
Rui Jin, Adam Fouda, Alexander Magunia +19
The nonlinear interaction of x-rays with matter is at the heart of understanding and controlling ultrafast molecular dynamics from an atom-specific viewpoint, providing new scienti…
X-ray Coulomb explosion imaging reveals role of molecular structure in internal conversion
Till Jahnke, Sebastian Mai, Surjendu Bhattacharyya +26
Molecular photoabsorption results in an electronic excitation/ionization which couples to the rearrangement of the nuclei. The resulting intertwined change of nuclear and electroni…
Controlled molecule injector for cold, dense, and pure molecular beams at the European x-ray free-electron laser
Lanhai He, Melby Johny, Thomas Kierspel +27
A permanently available molecular-beam injection setup for controlled molecules (COMO) was installed and commissioned at the small quantum systems (SQS) instrument at the European…
Ultrafast Nuclear Dynamics in Double-Core Ionized Water Molecules
Iyas Ismail, Ludger Inhester, Tatiana Marchenko +30
Double-core-hole (DCH) states in isolated water and heavy water molecules, resulting from the sequential absorption of two x-ray photons, have been investigated. A comparison of th…
Generation of Large Vortex-Free Superfluid Helium Nanodroplets
Anatoli Ulmer, Andrea Heilrath, Björn Senfftleben +38
Superfluid helium nanodroplets are an ideal environment for the formation of metastable, self-organized dopant nanostructures. However, the presence of vortices often hinders their…
Diffraction imaging of light induced dynamics in xenon-doped helium nanodroplets
Bruno Langbehn, Yevheniy Ovcharenko, Andrew Clark +23
We have explored the light induced dynamics in superfluid helium nanodroplets with wide-angle scattering in a pump-probe measurement scheme. The droplets are doped with xenon atoms…
Resonance-enhanced multiphoton ionization in the x-ray regime
Aaron C. LaForge, Sang-Kil Son, Debadarshini Mishra +16
Here, we report on the nonlinear ionization of argon atoms in the short wavelength regime using ultraintense x rays from the European XFEL. After sequential multiphoton ionization,…
The 1-Megapixel pnCCD Detector for the Small Quantum Systems Instrument at the European XFEL: System and Operation Aspects
Markus Kuster, Karim Ahmed, Kai-Erik Ballak +21
The X-ray free-electron lasers that became available during the last decade, like the European XFEL (EuXFEL), place high demands on their instrumentation. Especially at low photon…
Time-resolved study of resonant interatomic Coulombic decay in helium nanodroplets
A. C. LaForge, R. Michiels, Y. Ovcharenko +30
When weakly-bound complexes are multiply excited by intense electromagnetic radiation, energy can be exchanged between neighboring atoms through a type of resonant interatomic Coul…
Ultrafast relaxation of photoexcited superfluid He nanodroplets
M. Mudrich, A. LaForge, F. Stienkemeier +21
The relaxation of photoexcited nanosystems is a fundamental process of light-matter interaction. Depending on the couplings of the internal degrees of freedom, relaxation can be ul…
Deep neural networks for classifying complex features in diffraction images
Julian Zimmermann, Bruno Langbehn, Riccardo Cucini +13
Intense short-wavelength pulses from free-electron lasers and high-harmonic-generation sources enable diffractive imaging of individual nano-sized objects with a single x-ray laser…
Two-photon resonant excitation of interatomic coulombic decay in neon dimers
A Dubrouil, M Reduzzi, M Devetta +21
The recent availability of intense and ultrashort extreme ultraviolet sources opens the possibility to investigate ultrafast electronic relaxation processes in matter in an unprece…
Time-resolved observation of interatomic Coulombic decay induced by two-photon double excitation of Ne
T. Takanashi, N. V. Golubev, C. Callegari +46
The hitherto unexplored two-photon doubly-excited states [Ne()] were experimentally identified using the seeded, fully coherent, intense extreme ultraviolet…
Autoionization dynamics of He nanodroplets resonantly excited by intense XUV laser pulses
Y. Ovcharenko, A. LaForge, B. Langbehn +16
The ionization dynamics of helium droplets in a wide size range from 220 to 10^6 He atoms irradiated with intense femtosecond extreme ultraviolet (XUV) pulses of 10^9 ÷ 10^{12} W/c…
Three-Dimensional Shapes of Spinning Helium Nanodroplets
Bruno Langbehn, Katharina Sander, Yevheniy Ovcharenko +23
A significant fraction of superfluid helium nanodroplets produced in a free-jet expansion have been observed to gain high angular momentum resulting in large centrifugal deformatio…
Coherent control with a short-wavelength Free Electron Laser
K. C. Prince, E. Allaria, C. Callegari +37
XUV and X-ray Free Electron Lasers (FELs) produce short wavelength pulses with high intensity, ultrashort duration, well-defined polarization and transverse coherence, and have bee…
Diffractive imaging of transient electronic core-shell structures in a nanoplasma
Daniela Rupp, Leonie Flückiger, Marcus Adolph +13
We have recorded the coherent diffraction images of individual xenon clusters with intense extreme ultraviolet pulses to elucidate the influence of light-induced electronic changes…
Coherent diffractive imaging of single helium nanodroplets with a high harmonic generation source
Daniela Rupp, Nils Monserud, Bruno Langbehn +14
Coherent diffractive imaging of individual free nanoparticles has opened novel routes for the in-situ analysis of their transient structural, optical, and electronic properties. So…
Collective Autoionization in Multiply-Excited Systems: A novel ionization process observed in Helium Nanodroplets
A. C. LaForge, M. Drabbels, N. Brauer +19
Free electron lasers (FELs) offer the unprecedented capability to study reaction dynamics and image the structure of complex systems. When multiple photons are absorbed in complex…