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Professor Andrew Orr-Ewing

Professor Andrew Orr-Ewing

Professor Andrew Orr-Ewing
M.A., D.Phil.(Oxon.), CChem FRSC, FRS


Area of research

Photochemistry, Spectroscopy and Reaction Dynamics

Office S302
School of Chemistry,
Cantock's Close, Bristol BS8 1TS
(See a map)

+44 (0) 117 928 7672


The research in my group uses several different types of lasers (including nanosecond and femtosecond pulsed lasers, and mid infra-red cw lasers) to study chemical reactivity, atmospheric chemistry, methods of trace gas detection, optical properties of aerosol particles, and molecular spectroscopy and photochemistry. We use ultrafast transient absorption spectroscopy to study chemical reaction dynamics in liquids, velocity map imaging to explore quantum-state resolved reactive scattering in the gas phase, and cavity enhanced spectroscopy methods for a variety of applications in atmospheric chemistry and aerosol science. In addition, we use computational methods such as ab initio electronic structure theory and molecular dynamics to aid the interpretation of experimental measurements. I was the lead investigator on the ERC Advanced Grant CAPRI (Chemical and Photochemical Dynamics of Reactions in Solution, 2012-2017) and my group is part of the EPSRC-funded Bristol - Oxford Programme Grant Chemical Applications of Velocity and Spatial Imaging. We also collaborate with Bristol colleagues Prof Mike Ashfold, Prof Jonathan Reid, Prof Dudley Shallcross, Prof Fred Manby and Dr David Glowacki on various of the above research projects.

Further details of my group's research activities can be found at the homepage of the Laser Chemistry, Spectroscopy and Dynamics Group and a full list of my publications is available here.

Our recent studies of reaction dynamics on ultrafast timescales in liquid solutions were published in Science in 2011. The cover picture shows reaction of CN radicals with cyclohexane in solution in dichloromethane. Theoretical insights from this work were published in 2011 in Nature Chemistry and also featured on the cover.  A paper on F-atom reactions in solution appeared in Science in 2015. 

Professor Orr-Ewing is a supervisor in the EPSRC Centre for Doctoral Training in Chemical Synthesis


I am a Professor of Physical Chemistry and was Head of Physical and Theoretical Chemistry from 2011-2014.  I joined the School of Chemistry in 1994 as the Eliz. Challenor Royal Society University Research Fellow.  Previously, I  obtained my D.Phil. in Physical Chemistry from the University of Oxford (supervisor, Prof Gus Hancock), and spent two years as a post-doctoral research associate in the group of Prof Richard Zare at Stanford University.  Prizes and Awards include the RSC Chemical Dynamics Award (2014), Tilden Prize (2009), Award in Optical Spectroscopy (2002), Marlow Medal (1999), and Harrison Memorial Prize (1994), a Royal Society - Wolfson Research Merit Award (2006-11), and the 2007 Broida Prize of the International Symposium on Free Radicals. I was elected as a Fellow of the Royal Society in 2017.


  • ultrafast lasers
  • velocity map imaging
  • chemical reactivity
  • atmospheric chemistry
  • trace gas detection
  • cw diode lasers
  • quantum cascade lasers
  • aerosol particles
  • photochemistry
  • molecular spectroscopy



School of Chemistry

Chemistry staff

Research sections

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Recent publications

View complete publications list in the University of Bristol publications system

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