203 citations · 1.4k across the 26 of their papers we have counts for
26 papers
Generation of entanglement using a short-wavelength seeded free-electron laser
Saikat Nandi, Axel Stenquist, Asimina Papoulia +25
Quantum entanglement between the degrees of freedom encountered in the classical world is challenging to observe due to the surrounding environment. To elucidate this issue, we inv…
Ultra-stable and versatile high-energy resolution setup for attosecond photoelectron spectroscopy
Sizuo Luo, Robin Weissenbilder, Hugo Laurell +12
Attosecond photoelectron spectroscopy is often performed with interferometric experimental setups that require outstanding stability. We demonstrate and characterize in detail an a…
Extreme ultraviolet wave packet interferometry of the autoionizing HeNe dimer
Daniel Uhl, Andreas Wituschek, Rupert Michiels +24
Femtosecond extreme ultraviolet wave packet interferometry (XUV-WPI) was applied to study resonant inter-atomic Coulombic decay (ICD) in the HeNe dimer. The high demands on phase s…
Time-resolved Ultrafast Interatomic Coulombic Decay in Superexcited Sodium-doped Helium Nanodroplets
Jakob D. Asmussen, Rupert Michiels, Ulrich Bangert +16
The autoionization dynamics of superexcited superfluid He nanodroplets doped with Na atoms is studied by extreme-ultraviolet (XUV) time-resolved electron spectroscopy. Following ex…
The photochemical ring-opening reaction of 1,3-cyclohexadiene: complex dynamical evolution of the reactive state
O. Travnikova, T. Piteša, A. Ponzi +19
The photochemically induced ring-opening isomerization reaction of 1,3-cyclohexadiene (CHD) to 1,3,5-hexatriene (HT) is a textbook example of a pericyclic reaction, and has been am…
Studying ultrafast Rabi dynamics with a short-wavelength seeded free-electron laser
Saikat Nandi, Edvin Olofsson, Mattias Bertolino +26
Rabi oscillations are periodic modulations of populations in two-level systems interacting with a time-varying field. They are ubiquitous in physics with applications in different…
Improved stabilization scheme for extreme ultraviolet quantum interference experiments
Daniel Uhl, Andreas Wituschek, Ulrich Bangert +18
Interferometric pump-probe experiments in the extreme ultraviolet (XUV) domain are experimentally very challenging due to the high phase stability required between the XUV pulses.…
Probing electronic decoherence with high-resolution attosecond photoelectron interferometry
David Busto, Hugo Laurell, Daniel Finkelstein Shapiro +14
Quantum coherence plays a fundamental role in the study and control of ultrafast dynamics in matter. In the case of photoionization, entanglement of the photoelectron with the ion…
Abiotic molecular oxygen production -- ionic pathway from sulphur dioxide
Måns Wallner, Mahmoud Jarraya, Saida Ben Yaghlane +7
Molecular oxygen, O, is vital to life on Earth and possibly on other planets. Although the biogenic processes leading to its accumulation in Earth's atmosphere are well underst…
Correlation Driven Transient Hole Dynamics Resolved in Space and Time in the Isopropanol Molecule
T. Barillot, O. Alexander, B. Cooper +46
The possibility of suddenly ionized molecules undergoing extremely fast electron hole dynamics prior to significant structural change was first recognized more than 20 years ago an…
Collective enhancement of above threshold ionization by resonantly excited helium nanodroplets
R. Michiels, M. Abu-samha, L. B. Madsen +18
Clusters and nanodroplets hold the promise of enhancing high-order nonlinear optical effects due to their high local density. However, only moderate enhancement has been demonstrat…
Unravelling the Full Relaxation Dynamics of Superexcited Helium Nanodroplets
Jakob D. Asmussen, Rupert Michiels, Katrin Dulitz +20
The relaxation dynamics of superexcited superfluid He nanodroplets is thoroughly investigated by means of extreme-ultraviolet (XUV) femtosecond electron and ion spectroscopy comple…
Following excited-state chemical shifts in molecular ultrafast x-ray photoelectron spectroscopy
Dennis Mayer, Fabiano Lever, David Picconi +17
The conversion of photon energy into other energetic forms in molecules is accompanied by charge moving on ultrafast timescales. We directly observe the charge motion at a specific…
Attosecond Pulse-shaping using a seeded free-electron laser
Praveen Kumar Maroju, Cesare Grazioli, Michele Di Fraia +41
Attosecond pulses are fundamental for the investigation of valence and core-electron dynamics on their natural timescale. At present the reproducible generation and characterisatio…
Transient Resonant Auger-Meitner Spectra of Photoexcited Thymine
Thomas J. A. Wolf, Alexander C. Paul, Sarai D. Folkestad +15
We present the first investigation of excited state dynamics by resonant Auger-Meitner spectroscopy (also known as resonant Auger spectroscopy) using the nucleobase thymine as an e…
High-Gain Harmonic Generation with temporally overlapping seed pulses and application to ultrafast spectroscopy
Andreas Wituschek, Lukas Bruder, Enrico Allaria +22
Collinear double-pulse seeding of the High-Gain Harmonic Generation (HGHG) process in a free-electron laser (FEL) is a promising approach to facilitate various coherent nonlinear s…
Attosecond electron-spin dynamics in Xe 4d photoionization
Shiyang Zhong, Jimmy Vinbladh, David Busto +12
The photoionization of xenon atoms in the 70-100 eV range reveals several fascinating physical phenomena such as a giant resonance induced by the dynamic rearrangement of the elect…
Tracking the Ultraviolet Photochemistry of Thiophenone During and Beyond the Initial Ultrafast Ring Opening
Shashank Pathak, Lea M. Ibele, Rebecca Boll +19
Photoinduced isomerization reactions, including ring-opening reactions, lie at the heart of many processes in nature. The mechanisms of such reactions are determined by a delicate…
Attosecond timing of electron emission from a molecular shape resonance
S. Nandi, E. Plésiat, S. Zhong +11
Shape resonances in physics and chemistry arise from the spatial confinement of a particle by a potential barrier. In molecular photoionization, these barriers prevent the electron…
Coulomb explosion of CD3I induced by single photon deep inner-shell ionisation
M. Wallner, J. H. D. Eland, R. J. Squibb +8
L-shell ionisation and subsequent Coulomb explosion of fully deuterated methyl iodide, CDI, irradiated with hard x-rays has been examined by a time-of-flight multi-ion coincide…
Tracking Attosecond Electronic Coherences Using Phase-Manipulated Extreme Ultraviolet Pulses
Andreas Wituschek, Lukas Bruder, Enrico Allaria +31
The recent development of ultrafast extreme ultraviolet (XUV) coherent light sources bears great potential for a better understanding of the structure and dynamics of matter. Promi…
Probing ultrafast ππ*/nπ* internal conversion in organic chromophores via K-edge resonant absorption
T. J. A. Wolf, R. H. Myhre, J. P. Cryan +21
Organic chromophores with heteroatoms possess an important excited state relaxation channel from an optically allowed ππ* to a dark nπ*state. We exploit the element and site specif…
Machine learning applied to single-shot x-ray diagnostics in an XFEL
A. Sanchez-Gonzalez, P. Micaelli, C. Olivier +39
X-ray free-electron lasers (XFELs) are the only sources currently able to produce bright few-fs pulses with tunable photon energies from 100 eV to more than 10 keV. Due to the stoc…
Delayed Ultrafast X-ray Auger Probing (DUXAP) of Nucleobase Ultraviolet Photoprotection
B. K. McFarland, J. P. Farrell, S. Miyabe +28
We present a new method for ultrafast spectroscopy of molecular photoexcited dynamics. The technique uses a pair of femtosecond pulses: a photoexcitation pulse initiating excited s…