Laser-sub-cycle two-dimensional electron momentum mapping using orthogonal two-color fields

TL;DR

This paper demonstrates a method using orthogonal two-color laser fields for sub-cycle electron momentum mapping in photoelectron spectroscopy, revealing how the parent ion influences electron trajectories based on their emission timing.

Contribution

It introduces a novel application of orthogonal two-color laser fields for sub-cycle electron momentum mapping, providing new insights into electron-ion interactions during ionization.

Findings

Electron trajectories are affected differently by the ion's Coulomb field depending on their sub-cycle emission time.

The method allows experimental access to electron dynamics at sub-cycle timescales.

The approach enhances understanding of electron emission processes in strong-field ionization.

Abstract

The two-dimensional sub-cycle-time to electron momentum mapping provided by orthogonal two-color laser fields is applied to photoelectron spectroscopy. Using neon as the example we gain experimental access to the dynamics of emitted electron wave packets in electron momenta spectra measured by coincidence momentum imaging. We demonstrate the opportunities provided by this time-to-momentum mapping by investigating the influence of the parent ion on the emitted electrons on laser-sub-cycle times. It is found that depending on their sub-cycle birth time the trajectories of photoelectrons are affected differently by the ion's Coulomb field.