1. Low-Energy Interference Structure with Attosecond Temporal Resolution
- Author
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Ming Zhu, Wei Quan, XiaoJun Liu, Cheng Lin, Wenbin Jia, Qibing Xue, Xiaohong Song, Xiwang Liu, Jing Chen, Weifeng Yang, and Hongdan Zhang
- Subjects
Physics ,business.industry ,Atomic Physics (physics.atom-ph) ,Attosecond ,FOS: Physical sciences ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Physics - Atomic Physics ,Low energy ,Optics ,Interference (communication) ,Temporal resolution ,Physics::Atomic Physics ,business ,Optics (physics.optics) ,Physics - Optics - Abstract
Accessing precisely to the phase variation of electronic wave-packet (EWP) provides unprecedented spatiotemporal information of microworld. A radial interference pattern at near-zero energy has been widely observed in experiments of strong-field photoionization. However, the underlying physical picture of this interference pattern is still under debate. 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. Moreover, the observation of LEIS is independent of laser wavelength and specific atomic targets. Our result opens a promising new avenue for retrieving the structure and dynamics of EWPs in atoms and molecules with attosecond time resolution.
- Published
- 2020