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Personal profile

Research interests

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

Structured keywords and research groupings

  • Cabot Institute Environmental Change Research

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Research Output

  • Effects of ring-strain on the ultrafast photochemistry of cyclic ketones

    Kao, M-H., Venkatraman, R. K., Ashfold, M. N. R. & Orr-Ewing, A. J., 13 Jan 2020, In : Chemical Science. 11, p. 1991-2000 10 p.

    Research output: Contribution to journalArticle (Academic Journal)

    Open Access
  • 72 Downloads (Pure)

    Global and regional model simulations of atmospheric ammonia

    Khan, M. A. H., Lowe, D., Derwent, R. G., Foulds, A., Chhantyal-Pun, R., McFiggans, G., Orr-Ewing, A. J., Percival, C. J. & Shallcross, D. E., 1 Apr 2020, In : Atmospheric Research. 234, 12 p., 104702.

    Research output: Contribution to journalArticle (Academic Journal)

  • Prizes

    Fellow of the Royal Society

    Orr-Ewing, Andrew J (Recipient), 5 May 2017

    Prize: Election to learned society


    • 4 Hosting an academic visitor
    • 3 Advisory work for/on national or international committee or working group
    • 2 Membership or peer review panel or committee
    • 1 Participation in conference

    GRC Conference on Vibrational Spectroscopy

    Andrew J Orr-Ewing (Chair)


    Activity: Participating in or organising an event typesParticipation in conference

    Royal Society (External organisation)

    Andrew J Orr-Ewing (Member)


    Activity: Membership typesMembership or peer review panel or committee

    Heather Lewandowski

    Andrew J Orr-Ewing (Host)

    10 Oct 20157 Nov 2015

    Activity: Hosting a visitor typesHosting an academic visitor

    Supervised Work

    Improving Our Understanding of the Optical Properties of Atmospheric Aerosols

    Author: Willoughby, R., 23 Jan 2019

    Supervisor: Reid, J. (Supervisor) & Orr-Ewing, A. (Supervisor)

    Student thesis: Doctoral ThesisDoctor of Philosophy (PhD)