Manipulating the electron dynamics in non-sequential double ionization process of Ar atoms by orthogonal two-color laser field

Abstract

Abstract Electron dynamics during non-sequential double ionization (NSDI) is one of the most attractive research orientations in laser-atom or molecule interaction field. Based on the classic 2D model, the NSDI process of argon atoms driven by a few-cycle orthogonal two-color (OTC) laser field composed of 800 and 400nm laser pulses is studied. By changing the relative phase of two laser pulses, a localized enhancement of NSDI yield is observed at 0.5π and 1.5π which could be attributed to a rapid and substantial increase in the number of electrons returning to the parent ion within extremely short time intervals at these specific phases. Through the analysis of the electron-electron momentum correlations within different time windows of NSDI events and the angular distributions of emitted electrons in different channels, we observed a more pronounced electron-electron correlation phenomenon in the recollision-induced ionization (RII) channel. This is attributed to the shorter delay time in the RII channel.