# Resonant single-photon double ionization driven by combined intra- and interatomic electron correlations

## TL;DR

This paper investigates a resonant double ionization process in atoms driven by combined intra- and interatomic electron correlations, highlighting its dominance over direct ionization and the influence of neighboring atom positioning.

## Contribution

It introduces a novel mechanism of double ionization involving resonant excitation and energy transfer between atoms, emphasizing the role of electron correlations and spatial configuration.

## Key findings

- Process can dominate over direct double photoionization by several orders of magnitude.
- The relative position of the neighboring atom affects the angular distribution of emitted electrons.
- Resonant excitation and energy transfer are key to the ionization mechanism.

## Abstract

Double ionization of an atom by single-photon absorption in the presence of a neighbouring atom is studied. The latter is, first, resonantly photoexcited and, afterwards, transfers the excitation energy radiationlessly to the other atom, leading to its double ionization. The process relies on the combined effect of interatomic and intraatomic electron correlations. It can dominate over the direct double photoionization by several orders of magnitude at interatomic distances up to few nanometers. The relative position of the neighbouring atom is shown to exert a characteristic influence on the angular distribution of emitted electrons.