Andrew J Orr-Ewing

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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Projects

1 Active
23 Finished

Mapping Pathways in Photocatalytic Cycles using Ultrafast Spectroscopy

Orr-Ewing, A. J.

1/03/18 → 28/02/21

Project: Research

PhARRAO: Global Fellowship Barbara Marchetti

Orr-Ewing, A. J.

1/07/17 → 30/06/20

Project: Research

Kinetic Studies of Reactive Intermediates from the Oxidation of Atmospheric Alkenes

Orr-Ewing, A. J.

1/04/17 → 30/09/20

Project: Research

Research Output

236 Article (Academic Journal)
7 Conference Contribution (Conference Proceeding)
4 Comment/debate (Academic Journal)
4 Editorial (Academic Journal)
9 More

Criegee Intermediates: Production, Detection and Reactivity

Chhantyal Pun, R., Khan, M. A. H., Taatjes, C. A., Percival, C. J., Orr-Ewing, A. J. & Shallcross, D. E., 31 Jul 2020, In : International Reviews in Physical Chemistry. 39, 3, p. 385-424 41 p.

Research output: Contribution to journal › Article (Academic Journal)

Direct Observation of Ylide and Enol Intermediates Formed in Competition with Wolff Rearrangement of Photo-Excited Ethyl Diazoacetoacetate

Phelps, R. & Orr-Ewing, A. J., 29 Apr 2020, In : Journal of the American Chemical Society. 142, p. 7836-7844 9 p., 17.

Research output: Contribution to journal › Article (Academic Journal)

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 journal › Article (Academic Journal)

Open Access

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Datasets

Photochemical reactions of quinoliene-2-thiyl radicals

Koyama, D. (Creator) & Orr-Ewing, A. J. (Creator), University of Bristol, 2 Nov 2016

DOI: 10.5523/bris.6shpaaql5nn1lbf0jotdwc0j, http://data.bris.ac.uk/data/dataset/6shpaaql5nn1lbf0jotdwc0j

Dataset

Ultrafast Chemical Dynamics: BrCN photolysis in PFCs

Grubb, M. (Creator), Orr-Ewing, A. J. (Creator), Marroux, H. (Creator), Coulter, P. (Creator) & Ashfold, M. N. R. (Creator), University of Bristol, 12 Jul 2016

DOI: 10.5523/bris.2xxv3rqrmql41m55jnp7n6v89, http://data.bris.ac.uk/data/dataset/2xxv3rqrmql41m55jnp7n6v89

Dataset