Abstract
Fragmentation of , created by the impact of slow, highly charged ions on , has been studied by recoil ion momentum spectrometry. was found to dissociate into three ionic fragments through two channels: [the (1,2,1) channel] and [the (2,1,1) channel]. The kinetic energy of each fragment ion and the total kinetic energy release (KER) distributions for these channels were derived. Ab initio quantum chemical calculations at the multiconfiguration self-consistent-field configuration-interaction level of theory were carried out to obtain the potential energy curves of , from which the expected KER values were derived. A comparison of the experimental KER distributions with the expected KER values for different excited states enabled the estimation of the relative probabilities of accessing different electronic states of . These probabilities were found to depend on the projectile charge . The fragmentation was visualized using the Dalitz plots, which revealed that the (1,2,1) channel arises exclusively via concerted fragmentation, while the (2,1,1) channel also has a small contribution from sequential fragmentation.
- Received 18 December 2020
- Revised 23 February 2021
- Accepted 1 March 2021
DOI:https://doi.org/10.1103/PhysRevA.103.032821
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