Issue 10, 2023

Branching ratios in the dissociative photoionization of iodomethane by photoelectron photoion coincidence

Abstract

Iodomethane yields ten fragment ions after valence photoionization, in part by multiple dissociation pathways for each, thanks to a plethora of electronic states available in the parent ion as well as in the fragments. The comprehensive breakdown diagram from 11 eV to the double ionization onset, i.e., 26.7 eV, is recorded at high resolution using double imaging photoelectron photoion coincidence spectroscopy with synchrotron vacuum ultraviolet radiation. Based on fragment ion groupings, the changing branching ratios between these groups and between fragment ions within each group, as well as ancillary thermochemistry, we provide an overview of the dissociation pathways at play. Statistical and impulsive dissociations are identified using kinetic energy release analysis. Finally, a newly observed regime change is discussed in double ionization, whereby coincident H+ + I+ formation dominates over a 4 eV photon energy range, outcompeting the normally prevailing CH3+ + I+ channel.

Graphical abstract: Branching ratios in the dissociative photoionization of iodomethane by photoelectron photoion coincidence

Article information

Article type
Paper
Submitted
21 jul. 2022
Accepted
19 feb. 2023
First published
20 feb. 2023

Phys. Chem. Chem. Phys., 2023,25, 7383-7393

Branching ratios in the dissociative photoionization of iodomethane by photoelectron photoion coincidence

A. Bodi, A. Hafliðason and Á. Kvaran, Phys. Chem. Chem. Phys., 2023, 25, 7383 DOI: 10.1039/D2CP03339A

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