Timing analysis of two-electron photoemission

TL;DR

This paper predicts a measurable delay in two-electron photoemission from helium after attosecond XUV pulse excitation, using quantum simulations and phase analysis, suggesting new experimental avenues to explore correlated ionization dynamics.

Contribution

It introduces a novel prediction of delay in two-electron photoemission and links it to the phase derivative of the DPI amplitude, combining time-dependent Schrödinger equation solutions with close-coupling calculations.

Findings

Significant delay in two-electron photoemission predicted

Delay related to energy derivative of DPI phase

Method combines Schrödinger equation and close-coupling analysis

Abstract

We predict a significant delay of two-electron photoemission from the helium atom after absorption of an attosecond XUV pulse. We establish this delay by solving the time dependent Schr\"odinger equation and by subsequent tracing the field-free evolution of the two-electron wave packet. This delay can also be related to the energy derivative of the phase of the complex double photoionization (DPI) amplitude which we evaluate by the convergent close-coupling method. Our observations prompt future attosecond streaking experiments on DPI of He which can elucidate various mechanisms of this strongly correlated ionization process.