# Photodissociation as a probe of the H$_3^+$ avoided crossing seam

## TL;DR

This study investigates how the avoided crossing seam influences the photodissociation of H$_3^+$, using experimental imaging and modeling to understand the dynamics and implications for astrophysical charge transfer reactions.

## Contribution

It provides new experimental and theoretical insights into the role of the avoided crossing seam in H$_3^+$ photodissociation, highlighting its astrophysical significance.

## Key findings

- Photodissociation produces cold H$_2^+$ and hot H$_2$ from hot H$_3^+$.
- Wavepacket modeling explains ground state repopulation.
- Avoided crossing seam is crucial for charge transfer reactions.

## Abstract

Experiments are conducted to investigate the role of the avoided crossing seam in the photodissociation of H$_3^+$. Three-dimensional imaging of dissociation products is used to determine the kinetic energy release and branching ratio among the fragmentation channels. Vibrational distributions are measured by dissociative charge transfer of H$_2^+$ products. It is found that the photodissociation of hot H$_3^+$ in the near ultraviolet produces cold H$_2^+$, but hot H$_2$. Modelling the wavepacket dynamics along the repulsive potential energy surface accounts for the repopulation of the ground potential energy surface. The role of the avoided crossing seam is emphasized and its importance for the astrophysically relevant charge transfer reactions is underlined.