Propylene oxide, a favorite target of experimental and theoretical studies of circular dichroism, was recently discovered in interstellar space, further amplifying the attention to its role in the current debate on protobiological homochirality. In the present work, a photoelectron-photoion-photoion coincidence technique, using an ion-imaging detector and tunable synchrotron radiation in the 18.0-37.0 eV energy range, permits us (i) to observe six double ionization fragmentation channels, their relative yields being accounted for about two-thirds by the couple (C2H4+, CH2O+) and one-fifth by (C2H3+, CH3O+); (ii) to measure thresholds for their openings as a function of photon energy; and (iii) to unravel a pronounced bimodality for a kinetic-energy-released distribution, fingerprint of competitive non-adiabatic mechanisms.

Double photoionization of propylene oxide: a coincidence study of the ejection of a pair of valence-shell electrons / Falcinelli, Stefano; Vecchiocattivi, Franco; Alagia, Michele; Schio, Luca; Richter, Robert; Stranges, Stefano; Catone, Daniele; Arruda, Manuela S.; Mendes, Luiz A. V.; Palazzetti, Federico; Aquilanti, Vincenzo; Pirani, Fernando. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 148:11(2018), pp. 1-7. [10.1063/1.5024408]

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

Schio, Luca;Stranges, Stefano;Catone, Daniele;
2018

Abstract

Propylene oxide, a favorite target of experimental and theoretical studies of circular dichroism, was recently discovered in interstellar space, further amplifying the attention to its role in the current debate on protobiological homochirality. In the present work, a photoelectron-photoion-photoion coincidence technique, using an ion-imaging detector and tunable synchrotron radiation in the 18.0-37.0 eV energy range, permits us (i) to observe six double ionization fragmentation channels, their relative yields being accounted for about two-thirds by the couple (C2H4+, CH2O+) and one-fifth by (C2H3+, CH3O+); (ii) to measure thresholds for their openings as a function of photon energy; and (iii) to unravel a pronounced bimodality for a kinetic-energy-released distribution, fingerprint of competitive non-adiabatic mechanisms.
chirality; dichroism; photoionization; oxides; synchrotron radiation; ions and properties; mass spectra;
01 Pubblicazione su rivista::01a Articolo in rivista
Double photoionization of propylene oxide: a coincidence study of the ejection of a pair of valence-shell electrons / Falcinelli, Stefano; Vecchiocattivi, Franco; Alagia, Michele; Schio, Luca; Richter, Robert; Stranges, Stefano; Catone, Daniele; Arruda, Manuela S.; Mendes, Luiz A. V.; Palazzetti, Federico; Aquilanti, Vincenzo; Pirani, Fernando. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 148:11(2018), pp. 1-7. [10.1063/1.5024408]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1122065
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