Dissociative electron attachment to 2-chlorotoluene: Unusual temperature effects for the formation of Cl−

Mahmoodi-Darian, Masoomeh; Denifl, Stephan; Probst, Michael; Huber, S.; Mauracher, Andreas; Scheier, P.; Märk, T.D.

doi:10.1016/j.cplett.2019.06.057

Cited by 3 publications

(2 citation statements)

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“…Furthermore, it is known from gas-phase experiments on bare molecules that the temperature of the neutral precursor may impact the amplitude of a resonance [267]. Thus it is not surprising that the amplitude of resonances of molecules embedded in a HND may differ significantly from those observed for molecules vaporized from a hot source [267].…”

Section: Ion Molecule Reactions Fragmentation Anions Multiply Charged...mentioning

confidence: 99%

Solvation of ions in helium

González‐Lezana

Echt

Gatchell

et al. 2020

International Reviews in Physical Chemistry

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In recent years several reviews of 4 He nanodroplets (HNDs) have been published in this Journal. The present one focuses on the solvation of atomic, molecular or cluster ions X ± in HNDs. After briefly reviewing the properties of so-called snowballs in bulk helium we discuss experimental conditions for the efficient synthesis of charged, doped HNDs. We show that the cluster ions observed in conventional mass spectrometers originate from fission of highly charged HNDs. Mass spectra of alkali clusters recorded near the ionization threshold of HNDs reveal the size limit beyond which the neutral cluster will be fully embedded in the HND. The abundance distributions of He N X ± ions solvated in helium frequently reveal local anomalies or magic numbers. We demonstrate that the ion abundance is approximately proportional to the dissociation energy D N = E N − E N −1 . A compilation of observed magic numbers will be presented together with theoretical data, including data for ions solvated in molecular hydrogen. Alternative methods to forming He N X + that do not rely on nozzle expansions will be summarized. Electronic excitation spectra of C + 60 and polycyclic aromatic hydrocarbon ions with up to 100 adsorbed helium atoms reveal the properties of the helium adsorption layer in quantitative detail. Next we discuss theoretical efforts to describe the interaction between ions and helium. We close with summarizing the size dependence of physical quantities computed for atomic alkali and alkaline earth cations in helium, such as binding energy, superfluid fraction, structural order, radial density profiles, and the existence of first and higher solvation shells.

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Section: Ion Molecule Reactions Fragmentation Anions Multiply Charged...mentioning

confidence: 99%

Solvation of ions in helium

González‐Lezana

Echt

Gatchell

et al. 2020

International Reviews in Physical Chemistry

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“…49 The efficiency of the bond-cleavage drops with the increasing distance (alkyl chains length) between the π* system and the dissociating bond. 50 It also leads to puzzling temperature effects 51 and angular distributions. 52,53 The effect demonstrated here, coupling induced by motion of a distant molecular part, has been suggested, 7,8,54 but this is its first experimental evidence.…”

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confidence: 99%

Distant Symmetry Control in Electron-Induced Bond Cleavage

Nag

Ranković

et al. 2022

J. Phys. Chem. Lett.

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We experimentally show that N–H bond cleavage in the pyrrole molecule following resonant electron attachment is allowed and controlled by the motion of the atoms which are not dissociating, namely, of the carbon-attached hydrogen atoms. We use this fact to steer the efficiency of this bond cleavage. In order to interpret the experimental findings, we have developed a method for locating all resonant and virtual states of an electron-molecule system in the complex plane, based on all-electron R-matrix scattering calculations. Mapping these as a function of molecular geometry allows us to separate two contributing dissociation mechanisms: a π* resonance formation inducing strong bending deformations and a nonresonant σ* mechanism originating in a virtual state. The coupling between the two mechanisms is enabled by the out-of-plane motion of the C–H bonds, and we show that it must happen on an ultrafast (few fs) time scale.

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Production of Nitrogen Dioxide, NO₂^–, Anion from Dissociative Electron Attachment to Nitromethane below 1 eV and Its Temperature Dependence: Direct vs Dipole Bound Mediated Processes

Abdoul-Carime,

Thiam,

Rabilloud

2024

J. Phys. Chem. Lett.

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Reaction induced by slow electrons is implicated in a large field of research and applications. Below 3-4 eV, dissociative electron attachment efficiently fragments molecules via (1) shape resonance or (2) mediated by the formation of a dipole bound anion. While the temperature dependence of process 1 is well-known, that of 2 is not clearly established. Nitromethane is the prototypical molecule for which the electron attachment leads to the formation of both a dipole bound and a covalent anion. We provide here a comprehensive study of the fragmentation of nitromethane by <1 eV electron and the unusual temperature effects attributed principally to process 2.

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Dissociative electron attachment to 2-chlorotoluene: Unusual temperature effects for the formation of Cl−

Cited by 3 publications

References 31 publications

Solvation of ions in helium

Solvation of ions in helium

Distant Symmetry Control in Electron-Induced Bond Cleavage

Production of Nitrogen Dioxide, NO₂^–, Anion from Dissociative Electron Attachment to Nitromethane below 1 eV and Its Temperature Dependence: Direct vs Dipole Bound Mediated Processes

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Dissociative electron attachment to 2-chlorotoluene: Unusual temperature effects for the formation of Cl−

Cited by 3 publications

References 31 publications

Solvation of ions in helium

Solvation of ions in helium

Distant Symmetry Control in Electron-Induced Bond Cleavage

Production of Nitrogen Dioxide, NO2–, Anion from Dissociative Electron Attachment to Nitromethane below 1 eV and Its Temperature Dependence: Direct vs Dipole Bound Mediated Processes

Contact Info

Product

Resources

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Production of Nitrogen Dioxide, NO₂^–, Anion from Dissociative Electron Attachment to Nitromethane below 1 eV and Its Temperature Dependence: Direct vs Dipole Bound Mediated Processes