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arXiv · 2608.04715

Rotational-state-controlled dissociative ionization dynamics in $\mathrm{CF_2I_2}$

Nidin Vadassery·Ivo S. Vinklárek·Sebastian Trippel·Jochen Küpper
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Abstract

We investigated strong-field dissociative ionization of $\mathrm{CF_2I_2}$ ensembles prepared in different initial rotational-state distributions using an electrostatic deflector. Pronounced changes in ion-channel branching ratios revealed a strong dependence of the fragmentation dynamics on the initial rotational excitation. Analysis of fragment yields and their laser-power dependences identifies resonance-enhanced multiphoton ionization through an intermediate excited state, $\mathrm{CF_2I_2^{\ast}}$. The measured branching behavior indicates competition between stabilization into bound ionic states and dissociative channels, driven by near-threshold non-adiabatic Coriolis-type coupling. Tuning the rotational energy by only a few $\mu$eV is sufficient to significantly alter the ionization dynamics and to redistribute the reaction products. These findings demonstrate the key role of rotational excitation in controlling non-adiabatic dynamics following strong-field ionization of $\mathrm{CF_2I_2}$.

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Nidin Vadassery, Ivo S. Vinklárek, Sebastian Trippel, Jochen Küpper. 2026-08-05. Rotational-state-controlled dissociative ionization dynamics in $\mathrm{CF_2I_2}$. https://arxiv.org/abs/2608.04715

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