# Halogen Migration in the Photofragmentation of Halothane

## TL;DR

This study explores how halothane breaks apart under light, revealing how fluorine atoms move during the process.

## Contribution

The paper identifies halogen migration during halothane photofragmentation and explains it through theoretical analysis.

## Key findings

- Halogen migration was observed in the formation of CHClF+ and CHBrF+ ions.
- DFT and NBO analysis clarified the mechanism behind the migration of fluorine atoms.
- The findings help explain halothane's atmospheric behavior and reactive species formation.

## Abstract

The photofragmentation of halothane (CF3CHBrCl) was studied with synchrotron radiation by photoionization efficiency (PIE) measurements and photoelectron–photoion coincidence (PEPICO) experiments, as well as by a theoretical exploration of potential energy surfaces. Among the other fragments, the formation of the CHClF+ and CHBrF+ ions, which involves the transfer of a F atom between the two moieties of the parent molecule, was observed. To understand the mechanisms leading to the halogen migration, a detailed theoretical study of the production of CHClF+, m/z 67+, based on DFT calculations and natural bond orbital (NBO) analysis was conducted. The results contribute to the understanding of the photochemistry of halothane, its polluting behavior in the high atmosphere, and the formation of highly reactive species.