# Two-center dielectronic recombination in slow atomic collisions

## TL;DR

This paper investigates two-center dielectronic recombination during slow atomic collisions, demonstrating that it can surpass single-center radiative recombination even at large interatomic distances.

## Contribution

It introduces and analyzes the dynamic variant of two-center dielectronic recombination in atomic collisions, showing its efficiency over single-center processes at large distances.

## Key findings

- Two-center recombination dominates over single-center at large distances.
- Efficiency persists despite average interatomic distances being much larger.
- Dynamic process outperforms static case in collision scenarios.

## Abstract

A free electron can form a bound state with an atomic center $A$ upon photo emission (radiative recombination). In the presence of a neighboring atom $B$, such a bound state can, under certain conditions, be also formed via resonant transfer of energy to $B$, with its subsequent relaxation through radiative decay (two-center dielectronic recombination). This two-center process is very efficient in the 'static' case where $A$ and $B$ form a weakly bound system, dominating over single-center radiative recombination up to internuclear distances as large as several nanometers. Here we study its dynamic variant in which recombination occurs when a beam of species $A$ collides with a gas of atoms $B$ and show that, even though the average distance between $A$ and $B$ in collisions is orders of magnitude larger than the typical size of a bound system, the two-center recombination can still outperform the single-center radiative recombination.