https://doi.org/10.1140/epjd/s10053-024-00917-4
Regular Article - Molecular Physics and Chemical Physics
Photo double-ionization of CO2 studied by photoelectron-photoelectron coincidence experiments at 20 eV excess energy in equal energy sharing conditions
1
Math and Science Department, Full Sail University, 3300 University Boulevard, 32792, Winter Park, FL, USA
2
Istituto di Struttura della Materia, Sede Secondaria di Montelibretti, Area della Ricerca di Roma 1, CP10 00015, Monterotondo Scalo, Italy
Received:
17
June
2024
Accepted:
20
September
2024
Published online:
15
October
2024
The Triple-Differential Cross Section (TDCS) for the Photo Double-Ionization of carbon dioxide molecule to the CO22+ X3 Σg− ground state has been measured at 20 eV excess energy. In the experiment the coincidence angular distributions of the two photoelectrons, where the direction of one photoelectron has been fixed at 0, 30 and 60° with respect to the direction of the polarization of the incident radiation, have been measured for a condition where the two photoelectrons equally share the excess energy. Care has been taken to perform the measurements with an energy resolution which enabled to isolate the TDCS of the X3Σ−g ground state of the dication. An appreciable contribution to TDCS at a relative angle θ12 = 180° has been observed and attributed to a favorite symmetry of the wavefunction of the two ejected electrons.
Giorgio Turri, Paola Bolognesi, and Lorenzo Avaldi have contributed equaly to this work.
Supplementary Information The online version contains supplementary material available at https://doi.org/10.1140/epjd/s10053-024-00917-4.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.