Severin Meister

Visualizing the strong field–induced molecular breakup of C 60 via x-ray diffraction

Kirsten Schnorr, Sven Augustin, Ulf Saalmann, Georg Schmid et autres

Laser-driven dynamics in polyatomic molecules poses a complex many-body problem. Understanding intense light-matter interaction is crucial for steering intramolecular quantum dynamical processes. Here, we record time-resolved x-ray diffraction images of [Formula: see text] molecules during and after their interaction with intense near-infrared …

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Imaging collective quantum fluctuations of the structure of a complex molecule

Benoît Richard, Rebecca Boll, Sourav Banerjee, Julia M. Schäfer et autres

Because of the Heisenberg uncertainty principle, the structure of a molecule fluctuates about its mean geometry, even in the ground state. Observing this fundamental quantum effect experimentally-particularly, revealing the collective nature of the structural quantum fluctuations-remains an unmet challenge for complex molecules. …

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Dynamics of highly-ionized diiodomethane: Coulomb explosion, energy exchange and rotating fragments

Florian Trost, Sergio Díaz‐Tendero, Hannes Lindenblatt, Severin Meister et autres

Abstract The dissociation dynamics of diiodomethane molecules (CH2I2) have been investigated following absorption of 98 eV XUV photons. In the measurement at the reaction microscope endstation at the free-electron laser FLASH2, ionic fragments created by 4d core ionization followed by Auger decay …

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Formation of singly ionized oxygen atoms from O 2 driven by XUV pulses: A toolkit for the breakup of free-electron-laser-driven diatomics

M. E. Mountney, Z. Wang, Severin Meister, Florian Trost et autres

We formulate a general hybrid quantum-classical technique to describe the interaction of diatomic molecules with XUV pulses. We demonstrate the accuracy of our model in the context of the interaction of the O 2 molecule with an XUV pulse with photon energy …

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Visualizing the strong field–induced molecular breakup of C60 via x-ray diffraction

Kirsten Schnorr, Sven Augustin, Ulf Saalmann, Georg Schmid et autres

Laser-driven dynamics in polyatomic molecules poses a complex many-body problem. Understanding intense light-matter interaction is crucial for steering intramolecular quantum dynamical processes. Here, we record time-resolved x-ray diffraction images of molecules during and after their interaction with intense near-infrared fields, giving direct …

Xenon photoionization in the vicinity of 4 d giant resonance and Cooper minimum using an XUV-NIR pump-probe experiment

Sonu Kumar, S. Düsterer, Ulrike Frühling, S. Ališauskas et autres

The relaxation processes in atomic xenon following core ionization of the 4 d and 4 p subshells by extreme ultraviolet (XUV) pulses from a free-electron laser (FLASH) are investigated using ion time-of-flight spectroscopy. We compare the dynamics following ionization and Auger-Meitner decays …

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Symmetry-breaking dynamics of a photoionized carbon dioxide dimer

Ester Livshits, Dror M. Bittner, Florian Trost, Severin Meister et autres

Photoionization can initiate structural reorganization of molecular matter and drive formation of new chemical bonds. Here, we used time-resolved extreme ultraviolet (EUV) pump – EUV probe Coulomb explosion imaging of carbon dioxide dimer ion $${\left({{{\rm{C}}}}{{{{\rm{O}}}}}_{2}\right)}_{2}^{+}$$ dynamics, that combined with ab initio molecular …

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Sub-50 fs temporal resolution in an FEL-optical laser pump-probe experiment at FLASH2

A. Atia-Tul-Noor, Sonu Kumar, Nora Schirmel, Benjamin Erk et autres

High temporal resolution is essential for ultra-fast pump-probe experiments. Arrival time jitter and drift measurements, as well as their control, become critical especially when combining XUV or X-ray free-electron lasers (FELs) with optical lasers due to the large scale of such facilities …

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Time-resolving state-specific molecular dissociation with XUV broadband absorption spectroscopy

Alexander Magunia, Marc Rebholz, Elisa Appi, Christina C. Papadopoulou et autres

The electronic and nuclear dynamics inside molecules are essential for chemical reactions, where different pathways typically unfold on ultrafast timescales. Extreme ultraviolet (XUV) light pulses generated by free-electron lasers (FELs) allow atomic-site and electronic-state selectivity, triggering specific molecular dynamics while providing femtosecond …

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Direct tracking of ultrafast proton transfer in water dimers

Kirsten Schnorr, Michal Belina, Sven Augustin, Hannes Lindenblatt et autres

Upon ionization, water forms a highly acidic radical cation H 2 O +· that undergoes ultrafast proton transfer (PT)—a pivotal step in water radiation chemistry, initiating the production of reactive H 3 O + , OH ⋅ radicals, and a (hydrated) electron. …

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Ultrafast Roaming Mechanisms in Ethanol Probed by Intense Extreme Ultraviolet Free-Electron Laser Radiation: Electron Transfer versus Proton Transfer

Enliang Wang, Nora G. Kling, Aaron C. LaForge, Razib Obaid et autres

Ultrafast H 2 + and H 3 + formation from ethanol is studied using pump-probe spectroscopy with an extreme ultraviolet (XUV) free-electron laser. The first pulse creates a dication, triggering H 2 roaming that leads to H 2 + and H 3 …

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Differential Measurement of Electron Ejection after Two-Photon Two-Electron Excitation of Helium

M. Straub, Thomas Ding, Marc Rebholz, Gergana Dimitrova Borisova et autres

We report the measurement of the photoelectron angular distribution of two-photon single-ionization near the 2p^{2} ^{1}D^{e} double-excitation resonance in helium, benchmarking the fundamental nonlinear interaction of two photons with two correlated electrons. This observation is enabled by the unique combination of intense …

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