Single photon double and triple ionization of allene
Journal article, 2022
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 H-3(+) 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.
Author
Veronica Idebohn
University of Gothenburg
Alistair J. Sterling
University of Oxford
Mans Wallner
University of Gothenburg
Emelie Olsson
University of Gothenburg
Richard J. Squibb
University of Gothenburg
Ugne Miniotaite
Student at Chalmers
Emma Forsmalm
University of Gothenburg
Malin Forsmalm
University of Gothenburg
Stefano Stranges
Sapienza University of Rome
Istituto Officina dei Materiali (CNR-IOM)
John M. Dyke
University of Southampton
Fernanda Duarte
University of Oxford
John H. D. Eland
University of Oxford
Raimund Feifel
University of Gothenburg
Physical Chemistry Chemical Physics
1463-9076 (ISSN) 1463-9084 (eISSN)
Vol. 24 2 786-796Subject Categories
Atom and Molecular Physics and Optics
Theoretical Chemistry
Condensed Matter Physics
DOI
10.1039/d1cp04666g
PubMed
34927639