Abstract
Accessing precisely the phase variation of electronic wave-packet (EWP) provides unprecedented spatiotemporal information of the microworld. A radial interference pattern at near-zero energy has been widely observed in experiments of strong-field photoionization. Here we report an experimental and theoretical investigation of this low-energy interference structure (LEIS) in mid-infrared laser fields. We clarify that the LEIS arises due to the soft-recollision mechanism, which was previously found to play a pivotal role in producing the pronounced low-energy structure. Specifically, the LEIS is induced by the interference between direct and soft-recollision EWPs launched within a 1/18 laser-cycle time scale in our experiments. Our result opens a promising new avenue for retrieving the structure and dynamics of EWPs in atoms and molecules with attosecond time resolution.
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