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Propylene oxide, a favorite target of experimental and theoretical studies ofcircular dichroism, was recently discovered in interstellar space, furtheramplifying the attention to its role in the current debate on protobiologicalhomochirality. In the present work, a photoelectron-photoion-photoioncoincidence technique, using an ion-imaging detector and tunable synchrotronradiation in the 18.0-37.0 eV energy range, permits: (i)-to observe sixdouble-ionization fragmentation channels, their relative yields being accountedfor about two-thirds by the couple (C2H4+, CH2O+), one-fifth by (C2H3+, CH3O+);(ii)-to measure thresholds for their openings as a function of photon energy;(iii)-to unravel a pronounced bimodality for a kinetic-energy-releaseddistribution, fingerprint of competitive non-adiabatic mechanisms.

Double photoionization of propylene oxide: a coincidence study of the ejection of a pair of valence-shell electrons