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...

Fragmentation dynamics of CH3Clq+ (q = 2,3): theory and experiment

“…For other molecular systems, such experiments combined with advanced theoretical treatments allowed elucidating the unimolecular state-to-state reaction pathways undertaken by the doubly changed molecular ions formed by valence double photoionization of the corresponding neutral. 46,47,49,50…”

Symmetry breaking in core-valence double ionisation of allene

“…without coincidences, and thus without measurement of their spectra. The doubly-charged cations formed in this way have short lifetimes and undergo Auger decay to produce triply (or more highly) valence-ionized final states, mostly the same states characterised in the aforementioned recent investigation on multiply-valence-ionized allene 9 .…”

“…Subsequently, its double and triple ionisation have been studied by charge exchange methods accompanied by theoretical calculations 7 , 8 , where the lowest vertical double ionisation energy to the expected ground-state triplet was determined as 28.20.3 eV 7 . In a more recent work 9 , double and triple ionisation of allene using single-photon excitation were investigated in greater details by means of a complementary set of electron-electron, electron-ion and ion-ion coincidence spectroscopy methods, focusing on final states which reflected the removal of two or three electrons from the valence shell.…”