Rescattering of recolliding electron and low energy structure in few-cycle mid-infrared strong laser field: A 3D-TDSE study

•A 3D quantum approach is presented for studying low energy structure.•Angular distributions of PES in different polarized lasers are compared.•Low energy structure is suppressed in circularly polarized laser pulse.•Forward rescattering is responsible for low energy structure.•Low energy structure is correlated with high angular momenta.

Through the numerical solution of the 3D time-dependent Schrödinger equation, the two-dimensional photoelectron energy spectra (PES) of argon have been calculated, showing good accordance with the experimental measurements. Further analysis on the TDSE calculated data and comparison of PES under linearly and circularly polarized laser pulses demonstrated that the forward rescattering of the recolliding electron is mainly responsible for the appearance of the low energy structure (LES) in the PES. It is further revealed that the LES is correlated with the high angular momenta (l=8–13l=8–13) of the photoelectron.