Energy Sharing in the 2-Electron Attosecond Streak Camera

TL;DR

This paper investigates how energy sharing between two electrons in helium double ionization affects ionization dynamics and time delays, using a novel 2-electron streak camera technique to resolve these delays.

Contribution

It introduces the application of the 2-electron streak camera to analyze energy sharing and time delays in double ionization, revealing different dynamics for symmetric and asymmetric energy sharings.

Findings

Different energy sharings correspond to distinct ionization dynamics.

The Coulomb potential significantly influences asymmetric energy sharing.

The streak camera can resolve time delays between electron emissions.

Abstract

Using the recently developed concept of the 2-electron streak camera (see NJP 12, 103024 (2010)), we have studied the energy-sharing between the two ionizing electrons in single-photon double ionization of He(1s2s). We find that the most symmetric and asymmetric energy sharings correspond to different ionization dynamics with the ion's Coulomb potential significantly influencing the latter. This different dynamics for the two extreme energy sharings gives rise to different patterns in asymptotic observables and different time-delays between the emission of the two electrons. We show that the 2-electron streak camera resolves the time-delays between the emission of the two electrons for different energy sharings.