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Séminaire du Dr. Tom Kirchner (York University)

par ip2ct - publié le

Interatomic Coulombic decay in ion-dimer collisions
Tom Kirchner, York University

Free-electron production is an exceedingly rare process in low-energy ion-atom and ion-molecule collisions.
This may change if the target monomer is replaced by a dimer (or a larger cluster) which allows for interatomic Coulombic decay (ICD), i.e., the
transfer of enough excitation energy from one constituent to a neighbor so that an electron can be released from the latter.

ICD in neon dimers impacted by slow ions has recently been observed and semi-quantitatively explained by a classical over-the-barrier
model calculation. Using an independent-atom independent-electron model and a quantum-mechanical description of the electron dynamics we were
able to confirm the occurrence of ICD in 2.81 keV/amu triply-charged oxygen ion collisions after capture of an inner-valence Ne(2s) electron.
We also showed that triply-charged lithium ions are far less efficient in initiating ICD because the energy level structure of these projectiles makes 2s capture unlikely.

Conversely, more recent calculations suggest that low-energy alpha particles are very efficient ICD initiators, i.e., create a strong
low-energy electron yield in a regime in which continuum electrons are virtually nonexistent in ion-atom collisions.

In this talk, I will explain the main features and the limitations of our model, provide an overview of the results obtained, and discuss their implications.

date du séminaire : 16 mai 2022
contact : N. Sisourat (LCPMR)

Voir en ligne : Vidéo du séminaire