Andreas Hans

Influence of the ion charge state on emission energies of Auger electrons exemplified in Ar and Xe clusters

Niklas Golchert, Eetu Pelimanni, Nils Kiefer, Lutz Marder et autres

We report on the shift of energies released during Auger cascades in rare-gas ions, when the ions are not isolated but embedded in a homogeneous cluster. By combining high-resolution electron spectroscopy with multielectron coincidence spectroscopy of small Ar and Xe clusters, we …

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Publication data for: "Tunable Endo/Exo Selectivity in Direct Catalytic Asymmetric 1,3-Dipolar Cycloadditions with Polyfunctional Lewis Acid / Azolium-Aryloxide Catalysts"

Adrian Bürstner, Patrick Becker, Alexander Allgaier, Lucca Pfitzer et autres

This dataset contains research data for the publication "Tunable Endo/Exo Selectivity in Direct Catalytic Asymmetric 1,3-Dipolar Cycloadditions with Polyfunctional Lewis Acid / Azolium-Aryloxide Catalysts". Data type and creation: The dataset comprises experimental data focused on the magnetic and electronic characterization of the …

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Non-local X-ray intermolecular radiative decay probes solvation shell of ions in water

Johan Söderström, Lucas M. Cornetta, Victor Ekholm, Vincenzo Carravetta et autres

Abstract Aqueous solutions are crucial in chemistry, biology, environmental science, and technology. The chemistry of solutes is influenced by the surrounding solvation shell of water molecules, which have different chemical properties than bulk water due to their different electronic and geometric structure. …

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Excited State Assignment and State‐Resolved Photoelectron Circular Dichroism in Chalcogen‐Substituted Fenchones

Sudheendran Vasudevan, Steffen M. Giesen, Simon T. Ranecky, Lutz Marder et autres

Excited electronic states of fenchone, thiofenchone, and selenofenchone are characterized and assigned with different gas-phase spectroscopic methods and ab initio quantum chemical calculations. With an increasing atomic number of the chalcogen, increasing bathochromic (red) shifts are observed, which vary in strength for …

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Excited State Assignment and State-Resolved Photoelectron Circular Dichroism in Chalcogen-Substituted Fenchones

Sudheendran Vasudevan, Steffen M. Giesen, Simon T. Ranecky, Lutz Marder et autres

Excited electronic states of fenchone, thiofenchone, and selenofenchone are characterized and assigned with different gas-phase spectroscopic methods and ab initio quantum chemical calculations. With an increasing atomic number of the chalcogen, increasing bathochromic (red) shifts are observed, which vary in strength for …

Neutralization of Multiply Charged Ground-State Ions by Collective Electron Transfer from an Environment

Catmarna Küstner‐Wetekam, Nils Kiefer, Johannes H. Viehmann, Niklas Golchert et autres

Highly charged cations are omnipresent species after the interaction of high-energy or high-intensity light with matter. When embedded in environments, the mechanism and outcome of the redistribution of the cation's charge are crucial for the further fate of the whole system. Generally, …

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Site- and Energy-Selective Low-Energy Electron Emission by X-rays in the Aqueous Phase

Dana Bloß, Rémi Dupuy, Florian Trinter, I. Unger et autres

High Resolution Image Download MS PowerPoint Slide Low-energy-electron emission from resonant Auger final states via intermolecular Coulombic decay (RA-ICD) has previously been described as a promising scenario for controlling radiation damage for medical purposes, but it has so far only been observed …

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Photoelectron Circular Dichroism of a Chiral Molecule Induced by Resonant Interatomic Coulombic Decay from an Antenna Atom

Andreas Hans, J. Franz, Philipp V. Demekhin

We show that a nonchiral atom can act as an antenna to induce a photoelectron circular dichroism in a nearby chiral molecule in a three-step process: The donor atom (antenna) is initially resonantly excited by circularly polarized radiation. It then transfers its …

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Tunable Endo / Exo Selectivity in Direct Catalytic Asymmetric 1,3‐Dipolar Cycloadditions with Polyfunctional Lewis Acid / Azolium–Aryloxide Catalysts

Adrian Bürstner, Patrick Becker, Alexander Allgaier, Lucca Pfitzer et autres

Catalytic asymmetric 1,3-dipolar cycloadditions (1,3-DCA) using iminoesters as ylide precursors offer a powerful approach to accessing stereochemically complex, biologically relevant pyrrolidines. Although previous studies have already achieved impressive stereoselectivities, catalytic productivity remains a challenge, with turnover numbers (TON) typically below 20. In …

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Steuerbare endo / exo ‐Selektivität in direkten katalytisch‐ asymmetrischen 1,3‐dipolaren Cycloadditionen mit polyfunktionellen Lewis‐Säure‐/Azolium‐Aryloxid‐Katalysatoren

Adrian Bürstner, Patrick Becker, Alexander Allgaier, Lucca Pfitzer et autres

Kurzzusammenfassung Die katalytisch‐asymmetrische 1,3‐dipolare Cycloaddition (1,3‐DCA) mit Iminoestern als Ylid‐Vorstufen liefert einen effektiven Ansatz zur Synthese stereochemisch komplexer, biologisch relevanter Pyrrolidine. Obwohl frühere Studien bereits beeindruckende Stereoselektivitäten erzielten, ist die katalytische Produktivität eine Herausforderung, da die Umsatzzahlen (TON) typischerweise unter 20 lagen. …

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Data on yield and soil parameters of three diverse tilled long-term experimental sites in Austria (2018–2022)

Alexandra Tiefenbacher, Andreas Schaumberger, Hans‐Peter Kaul, Emanuel Zillner et autres

The agroecological "Marchfeld" cluster assessed the impact of tillage on primary production (yield) and selected soil parameters at three sites (two conventionally and one organically managed) from 2018-2022. The data were uniformly compiled in a data set. The examined factors were no, …

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Experimental benchmarking of relative potential energy minima internuclear distances with femtometer length accuracy

Adrian Krone, Philipp Schmidt, Johannes H. Viehmann, Peter Baumgärtel et autres

The two-dimensional photon-excitation photon-emission (PhexPhem) map of the archetypal H 2 molecule, constructed from dispersed-fluorescence measurements after energy-scanning excitation by small-bandwidth photons, displays complete systems of its Condon diffraction bands. They originate from spontaneous radiative dissociation of individual bound electronically excited rovibronic …

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