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[Formula: see text]-roaming dynamics in the formation of [Formula: see text] following two-photon double ionization of ethanol and aminoethanol.
Sci Rep
January 2025
Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark.
Roaming reactions involving a neutral fragment of a molecule that transiently wanders around another fragment before forming a new bond are intriguing and peculiar pathways for molecular rearrangement. Such reactions can occur for example upon double ionization of small organic molecules, and have recently sparked much scientific interest. We have studied the dynamics of the [Formula: see text]-roaming reaction leading to the formation of [Formula: see text] after two-photon double ionization of ethanol and 2-aminoethanol, using an XUV-UV pump-probe scheme.
View Article and Find Full Text PDFWe study resonance redistribution mechanisms inside a hot vapor cell. This is achieved by pumping cesium atoms on the 6S→6P resonance and subsequently probing the velocity distribution of the 6P population by a linear absorption experiment on the 6P→16S or 6P→15D transitions at 514 nm and 512 nm, respectively. We demonstrate that despite the existence of thermalization processes, traces of the initial velocity selection, imposed by the pump, survive in hyperfine levels of the intermediate (6P) state.
View Article and Find Full Text PDFFeshbach hypothesis of high-Tc superconductivity in cuprates.
Nat Commun
January 2025
Department of Physics and Arnold Sommerfeld Center for Theoretical Physics (ASC), Ludwig-Maximilians-Universität München, München, Germany.
Article Synopsis
- The study explores strong pairing mechanisms in many-body physics, particularly through a Feshbach perspective, focusing on interactions in Fermi-Hubbard models related to doped Mott insulators.
- It theorizes the presence of a low-energy excited state of two holes that facilitates near-resonant interactions, which aligns with observed behaviors in cuprate materials.
- The authors propose experimental methods like cARPES and pair-tunneling measurements to test their theories, suggesting a link between emergent Feshbach resonances and superconductivity in antiferromagnetic Mott insulators.
The Heisenberg-RIXS instrument at the European XFEL.
J Synchrotron Radiat
January 2025
Institute Methods and Instrumentation for Synchrotron Radiation Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany.
Resonant inelastic X-ray scattering (RIXS) is an ideal X-ray spectroscopy method to push the combination of energy and time resolutions to the Fourier transform ultimate limit, because it is unaffected by the core-hole lifetime energy broadening. Also, in pump-probe experiments the interaction time is made very short by the same core-hole lifetime. RIXS is very photon hungry so it takes great advantage from high-repetition-rate pulsed X-ray sources like the European XFEL.
View Article and Find Full Text PDFUnderstanding photoacoustic signal formation in the presence of transparent thin films.
Photoacoustics
August 2024
Advanced Research Center for Nanolithography (ARCNL), Science Park 106, Amsterdam, 1098 XG, The Netherlands.
Strain-induced variation of the refractive index is the main mechanism of strain detection in photoacoustic experiments. However, weak strain-optic coupling in many materials limits the application of photoacoustics as an imaging tool. A straightforward deposition of a transparent thin film as a top layer has previously been shown to provide signal enhancement due to elastic boundary effects.
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