A research team has successfully observed and characterized the double ionization of ozone (O₃) induced by a single photon. This process, where two electrons are simultaneously ejected by the absorption of a single photon, is fundamental to understanding the interaction of light with matter and ultrafast electron dynamics in molecules. The study combines ionization experiments with product resolution and advanced theoretical calculations to unravel the underlying mechanisms of this complex phenomenon.

Single-photon double ionization is a process of interest in atomic and molecular physics, as it provides information about electron correlations within a system. In the case of ozone, a triatomic molecule with a complex electronic structure, this type of study is particularly challenging. The researchers used high-energy photons to induce ionization and employed coincidence-resolved mass spectroscopy to identify the resulting ions and their kinetic energies, allowing for the reconstruction of ionization events.

The experimental results, which include the detection of O₂⁺ and O⁺ as fragments of double ionization, were complemented by electronic structure and dynamics calculations. These theoretical models were crucial for interpreting the observations and determining the pathways through which double ionization occurs. Different dissociation channels were identified, and information about intermediate electronic states was obtained, revealing how the absorbed photon energy is redistributed among the molecule's electrons and nuclei.

This work not only deepens our understanding of molecular photoionization and electron correlations but also has implications for fields such as atmospheric chemistry and astrophysics, where the interaction of ultraviolet radiation with molecules like ozone is a key process. The ability to accurately model and predict the response of molecules to high-energy radiation is essential for understanding natural phenomena and developing new technologies.