Classical Trajectory Diagnosis of Finger-Like Pattern in the Correlated Electron Momentum Distribution for Helium Double Ionization

TL;DR

This paper uses a semiclassical model to analyze the formation of finger-like patterns in the electron momentum distribution during helium double ionization, revealing the roles of Coulomb attraction, electron repulsion, and field interaction.

Contribution

It identifies the microscopic trajectory configurations responsible for asymmetric electron energy sharing and analyzes the sub-cycle dynamics influencing the correlation pattern.

Findings

Correlation pattern sensitive to transverse electron momentum

Microscopic trajectories explain asymmetric energy sharing

Sub-cycle dynamics influence pattern formation

Abstract

With a semiclassical quasistatic model we identify the distinct roles of nuclear Coulomb attraction, final state electron repulsion and electron-field interaction in forming the finger-like (or V-shaped) pattern in the correlated electron momentum distribution for Helium double ionization [Phys. Rev. Lett. \textbf{99}, 263002; \emph{ibid}, 263003 (2007)]. The underlying microscopic trajectory configurations responsible for asymmetric electron energy sharing after electron-electron collision have been uncovered and corresponding sub-cycle dynamics are analyzed. The correlation pattern is found to be sensitive to the transverse momentum of correlated electrons.