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Fellows Directory

Richard Dixon

Professor Richard Dixon FRS


Elected: 1986


Richard Dixon has made significant contributions to experimental and theoretical spectroscopy, and its application to photon-induced reactive dynamics. His early studies used flash photolysis to yield the spectra of open shell radicals and ions. His insight into their novel vibronic properties led to the development of new theoretical models. Richard’s later use of tuneable and pulsed lasers revealed details of photolytic fragmentation and energy disposal.

For example, the fragmentation pattern for water (H2O or its isotopomers), excited by pulsed lasers in the deep ultraviolet, varies dramatically with the chosen state of excitation. The broken symmetry for HOD (where D is deuterium) revealed a new dissociation pathway involving four competing steps and five coupled electronic states. This is relevant to the photochemistry of water in the upper atmosphere where it is the principal source of the highly reactive OH and OD radicals.

Richard’s current research concentrates on the theory of molecular dynamics at the quantum state level and its application to photodissociation, and is being conducted in collaboration with Mike Ashfold and his research group.

Professional positions

Emeritus Professor, Senior Research Fellow, School of Chemistry, University of Bristol

Interests and expertise

Subject groups


DNA fragmentation, molecular spectroscopy, Photochemistry, Photolysis


  • Rumford Medal

    In recognition of his many contributions to molecular spectroscopy and to the dynamics of molecular photodissociation.