Spectroscopic validation of the roaming process in molecular dissociation was first reported for formaldehyde, but today roaming is acknowledged to be a nearly ubiquitous dissociation pathway. The process has been described as a frustrated dissociation process, and as such, direct detection of the roaming process is challenging. In the present study the cyclopropane dication is the starting point for a roaming process that results in the production of H3+. In our experiment, we measure the complete momenta of all charged fragments and unravel the kinematics for relevant fragmentation processes. We present a comprehensive study of the process comparing alternative pathways for dissociation and their kinematics in association to the roaming process. In this study, inner-shell electron ionisation leads to dication states, these final electronic states are fundamentally identical to ones reached via direct double ionisation.
}}, author = {{Lindblom, Ville and Ganguly, Smita and Walsh, Noelle and Gisselbrecht, Mathieu and Sorensen, Stacey L.}}, issn = {{1463-9076}}, language = {{eng}}, month = {{02}}, number = {{12}}, pages = {{7344--7351}}, publisher = {{Royal Society of Chemistry}}, series = {{Physical Chemistry Chemical Physics}}, title = {{Identification of the roaming mechanism and the formation of H3+ in core ionised cyclopropane}}, url = {{http://dx.doi.org/10.1039/d5cp04926a}}, doi = {{10.1039/d5cp04926a}}, volume = {{28}}, year = {{2026}}, }