Issue 2, 2022

Single photon double and triple ionization of allene

Abstract

Double and triple ionization of allene are investigated using electron–electron, ion–ion, electron–electron–ion and electron–electron–ion–ion (ee, ii, eei, eeii) coincidence spectroscopies at selected photon energies. The results provide supporting evidence for a previously proposed roaming mechanism in H3+ formation by double ionization. The lowest vertical double ionization energy is found to be 27.9 eV, while adiabatic double ionization is not accessed by vertical ionization at the neutral geometry. The triple ionization energy is found to be close to 50 eV in agreement with theoretical predictions. The doubly charged parent ion is stable up to about 2 eV above the threshold, after which dissociations by charge separation and by double charge retention occur with comparable intensities. Fragmentation to H+ + C3H3+ starts immediately above the threshold as a slow (metastable) decay with 130.5 ± 9.9 ns mean lifetime.

Graphical abstract: Single photon double and triple ionization of allene

Supplementary files

Article information

Article type
Paper
Submitted
11 10 2021
Accepted
09 12 2021
First published
09 12 2021
This article is Open Access
Creative Commons BY-NC license

Phys. Chem. Chem. Phys., 2022,24, 786-796

Single photon double and triple ionization of allene

V. Ideböhn, A. J. Sterling, M. Wallner, E. Olsson, R. J. Squibb, U. Miniotaite, E. Forsmalm, M. Forsmalm, S. Stranges, J. M. Dyke, F. Duarte, J. H. D. Eland and R. Feifel, Phys. Chem. Chem. Phys., 2022, 24, 786 DOI: 10.1039/D1CP04666G

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