# Experimental Separation of Sub-Cycle Ionization Bursts in Strong-Field Double Ionization of H$_2$

## TL;DR

This paper reports the first clear observation of sub-cycle ionization bursts in strong-field double ionization of H$_2$, achieved through advanced laser pulse techniques and coincidence imaging, enabling detailed study of molecular electron dynamics.

## Contribution

It introduces a method to disentangle sub-cycle ionization bursts in molecular double ionization using few-cycle laser pulses and coincidence momentum imaging.

## Key findings

- Observation of sub-cycle ionization bursts in H$_2$
- Disentanglement of ionization events in molecular frame
- Potential to study intramolecular electron dynamics

## Abstract

We report on the unambiguous observation of the sub-cycle ionization bursts in sequential strong-field double ionization of H$_2$ and their disentanglement in molecular frame photoelectron angular distributions. This observation was made possible by the use of few-cycle laser pulses with a known carrier-envelope phase in combination with multi-particle coincidence momentum imaging. The approach demonstrated here will allow sampling of the intramolecular electron dynamics and the investigation of charge-state specific Coulomb-distortions on emitted electrons in polyatomic molecules.