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September 10, 2025

Attosecond time delay in bound-bound transitions probed by Fano resonances

Key Points

Attosecond time delays of approximately 22 as were measured between different decay pathways.
The ellipticity dependence of Ne + XFID yield supports the tunneling-plus-rescattering model in strong laser fields.
This work demonstrates a method to probe interference effects from Fano resonances in high-order harmonics.
Through phase extraction from Fano structures, the study enhances understanding of ion dynamics in strong laser interaction.

Abstract

Abstract This letter presents a method for probing the attosecond time delay between two radiatively resonant transitions from Fano structures, which arise from interference between the extreme ultraviolet free induction decay (XFID) emission and high-order harmonics. The ellipticity dependence of the Ne + XFID yield confirms that the ionic excited-state populations originate from inelastic recollision between tunneling electrons and parent ions. Subsequent extraction of relative phases from Fano structures enables the determination of time delays (∼ 22 as) between the two decay pathways. This work provides an experimental approach to probe the attosecond time delay between different XFID channels and contributes to a deeper understanding of the tunneling-plus-rescattering model in strong laser fields.

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