Dissociative Electron Attachment (DEA)

Dissociative electron attachment (DEA) is one process by which bonds are broken following irradiation. Low-energy electrons, often produced as secondary products of high energy radiation, attach to a molecule following collision, resulting in an excited anion which may then decay via a number of pathways including dissociation.

Lab set-up

DEA OH LIF Spectrum

The aim of this project is to study DEA in gas-phase H2O. We monitor the production of OH radicals by detecting their laser-induced fluorescence after exciting the ground-state OH radicals with a tunable UV laser pulse. We have designed and built a high vacuum system incorporating a home-built electron gun, molecular beam and photomultiplier tube. We have recently obtained the first OH LIF spectra with our new setup, see below.

Electron gun construction Electron gun construction