Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session H01: Molecular & Biomolecular Collisions and Spectroscopy
8:00 AM–10:00 AM,
Wednesday, June 2, 2021
Co-Sponsoring
Unit:
GEC
Chair: James Colgan, LANL
Abstract: H01.00002 : Coulomb explosion imaging of carbon monoxide dimers*
8:30 AM–9:00 AM
Live
Presenter:
Amine CASSIMI
(CIMAP, CEA/CNRS/ENSICAEN/UNICAEN, Caen France)
Authors:
Amine CASSIMI
(CIMAP, CEA/CNRS/ENSICAEN/UNICAEN, Caen France)
Alain MERY
(CIMAP, CEA/CNRS/ENSICAEN/UNICAEN, Caen France)
Jimmy RANGAMA
(CIMAP, CEA/CNRS/ENSICAEN/UNICAEN, Caen, France)
Xavier FLECHARD
(Normandie Univ./ENSICAEN/UNICAEN/CNRS/LPC, Caen, France)
Benoit GERVAIS
(CIMAP, CEA/CNRS/ENSICAEN/UNICAEN, Caen, France)
Wania WOLFF
(Instituto de Fisica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil)
On the other hand, doubly charged diatomic ions have unusual properties leading to a wide range of lifetimes against dissociation. Their stability depends on both decay mechanisms and populated rovibronic levels with respect to the barrier height. Among the large variety of doubly charged diatomic species investigated so far, CO2+ is probably the one that has attracted the largest interest, with measured lifetimes ranging from submicroseconds to a few seconds.
We will report on experimental results obtained from collisions of slow highly charged Ar9+ ions with a carbon monoxide dimer (CO)2 target. A COLTRIMS setup and a Coulomb explosion imaging approach are used to reconstruct the structure of the CO dimers as well as its fragmentation dynamics. The three dimensional structure is deduced from the 2-body and 3-body dissociation channels from which both the intermolecular bond length and the relative orientation of the two molecules are determined. We will show how the lifetime of metastable states of the CO2+ dication affects the dimer fragmentation dynamics and thus giving access to its measurement.
*Experiment was performed at Grand Accelerateur National d'Ions Lourds (GANIL) by means of CIRIL Interdisciplinary Platform, part of CIMAP laboratory, Caen, France. The authors want to thank the CIMAP and GANIL staff for their technical support.
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