# Angle-resolved RABBIT: theory and numerics

## TL;DR

This paper develops a theoretical and numerical framework for angle-resolved RABBIT measurements, highlighting their potential for detailed photoionization analysis through interference effects and phase-sensitive observables.

## Contribution

It introduces a perturbative 2-photon model for AR-RABBIT and demonstrates its application to both model and real systems, expanding the understanding of this technique.

## Key findings

- AR-RABBIT reveals interference phenomena in photoelectron emission.
- The model predicts phase-sensitive angle-resolved photoelectron interferograms.
- Potential applications in photoionization metrology are identified.

## Abstract

Angle-resolved (AR) RABBIT measurements offer a high information content measurement scheme, due to the presence of multiple, interfering, ionization channels combined with a phase-sensitive observable in the form of angle and time-resolved photoelectron interferograms. In order to explore the characteristics and potentials of AR-RABBIT, a perturbative 2-photon model is developed; based on this model, example AR-RABBIT results are computed for model and real systems, for a range of RABBIT schemes. These results indicate some of the phenomena to be expected in AR-RABBIT measurements, and suggest various applications of the technique in photoionization metrology.