Sequential mechanism in H3+ formation dynamics on the ethanol dication

Krishnendu Gope, Dror M. Bittner, Daniel Strasser*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Two- and three-body Coulomb explosion dynamics of isolated ethanol dications are studied via single-photon double-ionization with ultrafast extreme-ultraviolet pulses. The measured 3-body momentum correlations obtained via 3D coincidence imaging of the ionic products provide evidence for several concerted and sequential mechanisms: (1) a concerted 3-body breakup mechanism, with dominating channels such as CH3+ + COH+ + H2; (2) sequential dissociation in which the ejection of a low-kinetic-energy neutral OH precedes the Coulomb explosion of C2H52+ → CH3+ + CH2+; and (3) a sequential 3-body breakup mechanism that dominates H3+ formation from the ethanol dication via a mechanism that is different from the well-studied H3+ formation in the 2-body Coulomb explosion of the methanol dication. Furthermore, we report surprising branching ratios of the competing C-O bond dissociation channels, resulting in H3O+, H2O+ and OH+ formation.

Original languageAmerican English
JournalPhysical Chemistry Chemical Physics
StateAccepted/In press - 2023

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© 2023 The Royal Society of Chemistry.


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