The rate of reactions important in astrochemical contexts can be much easier to study computationally than experimentally.  Knowledge of these reaction rates is vital for modelling the interstellar medium and other regions.  In this group there is a focus on the chemistry of nitrogen containing species.  Nitrogen astrochemistry is particularly challenging as molecular N2 cannot be readily observed by astronomers, making tracing interstallar nitrogen very difficult.  We typically study small molecule reactions such as NH+N, CN+N, NH++H2 and the CNO atom-diatom channels using a combination of ab initio quantum chemistry, adiabatic capture theory, quasiclassical trajectory studies and statistical theories to calculate rate constants and related quantities.  (With Stefan Andersson, Gunnar Nyman, Steven McNeil and Ming Teo)

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