Two-color polarization control on angularly resolved attosecond time delays

TL;DR

This paper introduces an analytical model to predict angularly-resolved attosecond time delays in photoionization, accounting for polarization effects and phase jumps, enhancing understanding of angle-dependent measurements.

Contribution

The paper presents a simple analytical framework to describe angularly-resolved RABBITT spectra based on polarization angles, explaining phase jumps with few parameters.

Findings

Analytical predictions match experimental delay variations.

Phase jumps are explained by quantum pathway contributions.

Delay dependencies are controllable via polarization angles.

Abstract

Measured photoionization time delays may exhibit large variations as a function of the emission angles, even for spherically symmetric targets, as shown in recent RABBITT (reconstruction of attosecond beating by interference of two-photon transitions) experiments. The contributions from different pathways to the two-photon quantum channels can already explain the observed phase jumps that shape those angular distributions. Here, we propose a simple analytical model to describe angularly-resolved RABBITT spectra as a function of the relative polarization angle between the ionizing attosecond pulse train and the assisting IR field. We demonstrate that the angular dependencies of the measured delays can be analytically predicted and the position of the phase jumps reduced to the analysis of a few relevant parameters.