Relative phase-dependent two-electron emission dynamics with two-color circularly polarized laser fields*

Abstract

With the semiclassical ensemble model, we explore the relative phase-dependent nonsequential double ionization (NSDI) of Mg by counter-rotating two-color circularly polarized (TCCP) laser pulses. The yield of Mg2+ sensitively depends on the relative phase Δφ and the intensity of TCCP laser fields. At Δφ = 1.5π, the yield of Mg2+ exhibits a pronounced peak in the 0.05 PW/cm2 laser field. This behavior results from the increase of the initial transverse velocity compensating for the drift velocity with the decreasing angle by analyzing the angular distributions of the electron pairs in four relative phases. By changing the relative phases, we find that the recollision excitation with subsequent ionization and the recollision-impact ionization mechanisms can be controlled with TCCP laser fields.

Influence of Coulomb force between two electrons on double ionization of He-like atoms

“…This Hamiltonian is widely used in other theoretical treatments. [16,[20][21][22] The vector potential of a laser field is…”

“…The other is for the Coulomb repulsion between two electrons and changes the double ionization rate mainly via the quantity in Eq. (21). The Coulomb force between the two electrons plays a key role in double ionization process, thus we focus on its influence in the following.…”

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

“…In the last two decades, a variety of theoretical and experimental methods have been used to explore electron energy correlations, [9,10] angular distribution correlations, [11] and recollision processes [12,13] in NSDI. Considering that electronic dynamics occurs on attosecond time scales, and the released electron trajectories are mainly manipulated by changing the laser field parameters, many researchers have utilized pulseshaping [14][15][16][17][18][19] or multi-color laser fields [20][21][22][23][24] to study the NSDI process. In particular, an orthogonal two-color (OTC) laser field, in which two laser beams with different frequencies are orthogonally polarized in space, has been widely used to control the electron dynamics.…”