# Dissociation dynamics in the dissociative electron attachment to ammonia molecule

## TL;DR

This study investigates the dissociation dynamics of ammonia molecules upon low-energy electron attachment, revealing resonance peaks, dissociation pathways, and fragment distributions using velocity slice imaging.

## Contribution

It provides detailed experimental insights into ammonia's dissociation mechanisms at specific resonant energies, including identification of symmetry states and fragment signatures.

## Key findings

- Resonance peaks at 5.5 eV and 10.5 eV observed.
- Dissociation primarily produces H$^-$ and NH$_2^-$ fragments.
- Signature of A$_1$ symmetry identified in the 10.5 eV resonance.

## Abstract

Complete dissociation dynamics of low energy electron attachment to ammonia molecule has been studied using velocity slice imaging (VSI) spectrometer. One low energy resonant peak around 5.5 eV and a broad resonance around 10.5 eV incident electron energy has been observed. The resonant states mainly dissociate via H$^-$ and NH$_2^-$ fragments, though for the upper resonant state, signature of NH$^-$ fragments are also predicted due to three body dissociation process. Kinetic energy and angular distributions of the NH$_2^-$ fragment anions are measured simultaneously using VSI technique. Based on our experimental observations, we find the signature of A$_1$ symmetry in the 10.5 eV resonance energy whereas, the 5.5 eV resonance is associated with the well known A$_1$ symmetry.