Interaction of hydantoin with solar wind minority ions: O6+ and He2+ - Équipe AMA « Atomes, molécules et agrégats » du CIMAP Accéder directement au contenu
Article Dans Une Revue Physical Chemistry Chemical Physics Année : 2020

Interaction of hydantoin with solar wind minority ions: O6+ and He2+

Résumé

The laboratory study of prebiotic molecules interacting with solar wind ions is essential to understand their role in the emergence of life in the complex context of astrochemistry of circumstellar environments. In this work, we present the first study of the interaction of hydantoin (C 3 N 2 O 2 H 4 , 100 amu) with Solar wind low energy multiply charged ions: O 6+ at 30 keV and He 2+ at 8 keV. The fragmentation mass spectra as well as correlation maps resulting from the collision are presented and discussed in this paper. Prompt and delayed dissosiation from metastable states of the ionized molelcule have been observed and corresponding life times mesured. Experimental results are completed by DFT numerical calculations of the energy and structures of the initial state of the molecule (z = 0,1,2,3) that show that the molecule can only support 2 charges before spontaneously dissociate. Calculations also demonstrate that the hydantoin's ring opens after double ionisation of the molecule wich may enhance its reactivity in the context of biological molecule formation in crimcum stellar environnement. For the major experimentally observed fragmentation pathways (like 44 amu / 56 amu dissociation), Internal Reaction Coordinate calculation was perfomed pointing out the important role of proton transfert in the fragmentation processes.
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Dates et versions

hal-02527292 , version 1 (12-11-2020)

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Julie Renoud, Suvasthika Indrajith, Alicja Domaracka, Patrick Rousseau, Patrick Moretto-Capelle, et al.. Interaction of hydantoin with solar wind minority ions: O6+ and He2+. Physical Chemistry Chemical Physics, 2020, 22 (10), pp.5785-5796. ⟨10.1039/C9CP06230K⟩. ⟨hal-02527292⟩
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