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 permits: (i) to observe six double-ionization fragmentation channels, their relative yields being accounted for about two-thirds by the couple (C2 H4+, CH2O+), one-fifth by (C2 H3+, CH3O+); (ii) to measure thresholds for their openings as a function of photon energy; (iii) to unravel a pronounced bimodality for a kinetic-energy-released distribution, fingerprint of competitive non-adiabatic mechanisms.
The double photoionization of propylene oxide in the 18.0 – 37.0 eV photon energy range
S. Falcinelli
;F. Vecchiocattivi;F. Palazzetti;V. Aquilanti;F. Pirani
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 permits: (i) to observe six double-ionization fragmentation channels, their relative yields being accounted for about two-thirds by the couple (C2 H4+, CH2O+), one-fifth by (C2 H3+, CH3O+); (ii) to measure thresholds for their openings as a function of photon energy; (iii) to unravel a pronounced bimodality for a kinetic-energy-released distribution, fingerprint of competitive non-adiabatic mechanisms.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
