Proton transfer and hydronium formation in ionized water
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| author | Vinklárek, Ivo S. Trippel, Sebastian Belina, Michal Blum, Luisa Bromberger, Hubertus Slavíček, Petr Küpper, Jochen |
| author_facet | Vinklárek, Ivo S. Trippel, Sebastian Belina, Michal Blum, Luisa Bromberger, Hubertus Slavíček, Petr Küpper, Jochen |
| contents | Aqueous radiation chemistry emerges through ultrafast proton transfer and ion-radical formation
with unexplored energy-redistribution dynamics steering the subsequent reactions. We performed
time-resolved disruptive probing on pure water dimer, (H$_2$O)$_2$, to disentangle the post-ionization
reactions. Through kinetic-energy-resolved ion imaging, we unraveled the dynamics in the (H$_2$O)$_2^+$
ground state: at low-energy ($\sim$0.05 eV) ultrafast proton transfer ($\sim$19 fs) is
followed by H$_3$O$^+$+OH fragmentation ($\sim$360 fs). At higher energies, proton
transfer becomes hindered ($\sim$60 fs) while the subsequent fragmentation becomes faster
($\sim$210 fs), evolving into coupled dynamics ($>0.15$ eV, $\sim$100 fs). Moreover, we
observed H$_2$O)$_2^+$ stabilization proceeding through a Zundel-like structure. This reveals how
ion-radical formation in ionized hydrogen-bonded networks shapes reactivity in aqueous dynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_17505 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Proton transfer and hydronium formation in ionized water Vinklárek, Ivo S. Trippel, Sebastian Belina, Michal Blum, Luisa Bromberger, Hubertus Slavíček, Petr Küpper, Jochen Chemical Physics Aqueous radiation chemistry emerges through ultrafast proton transfer and ion-radical formation with unexplored energy-redistribution dynamics steering the subsequent reactions. We performed time-resolved disruptive probing on pure water dimer, (H$_2$O)$_2$, to disentangle the post-ionization reactions. Through kinetic-energy-resolved ion imaging, we unraveled the dynamics in the (H$_2$O)$_2^+$ ground state: at low-energy ($\sim$0.05 eV) ultrafast proton transfer ($\sim$19 fs) is followed by H$_3$O$^+$+OH fragmentation ($\sim$360 fs). At higher energies, proton transfer becomes hindered ($\sim$60 fs) while the subsequent fragmentation becomes faster ($\sim$210 fs), evolving into coupled dynamics ($>0.15$ eV, $\sim$100 fs). Moreover, we observed H$_2$O)$_2^+$ stabilization proceeding through a Zundel-like structure. This reveals how ion-radical formation in ionized hydrogen-bonded networks shapes reactivity in aqueous dynamics. |
| title | Proton transfer and hydronium formation in ionized water |
| topic | Chemical Physics |
| url | https://arxiv.org/abs/2602.17505 |