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Fragmentation of Energy Selected Butadiyne- and 1,3-Pentadiyne Radical Cations

✍ Scribed by Josef Dannacher; Edgar Heilbronner; Jean-Pierre Stadelmann; Jürgen Vogt

Publisher
John Wiley and Sons
Year
1979
Tongue
German
Weight
802 KB
Volume
62
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Monomolecular fragmentations of butadiyne‐ and 1,3‐pentadiyne radical cations in their electronically excited states have been investigated by use of the photoelectron‐photoion coincidence technique. Breakdown curves for the molecular and various fragment ions have been recorded over the ionization energy range of 9 to 17 eV. These breakdown curves reveal the extent of the competition between the radiative relaxation (ion fluorescence) and the non‐radiative internal conversion followed by fragmentation for the decay of the first excited electronic states. Extensive hydrogen scrambling and/or ionic‐carbon‐skeleton isomerization takes place prior to fragmentation, as revealed by the breakdown curves obtained for the site specifically deuteriated 1,3‐pentadiynes.

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Unimolecular Fragmentation of Energy Selected Allene Molecular Cations
✍ Josef Dannacher; Jürgen Vogt 📂 Article 📅 1978 🏛 John Wiley and Sons 🌐 German ⚖ 637 KB

## Abstract The unimolecular fragmentations of internal energy selected allene molecular ions (**1**^+^) have been investigated by photoelectron‐photoion coincidence spectroscopy. The energy dependence of the branching ratio between the two most important fragmentation channels is reported, togethe