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Research interests

Dynamics and Kinetics of Molecular Collisions Collisions between molecules resulting in energy transfer or reaction are the fundamental interactions of chemistry. The research in my group is aimed at deepening our understanding of these elementary steps, and uses the unique properties of lasers to prepare and probe the reagents and products. This work is carried out jointly with Prof Ken McKendrick (see our joint research group webpages). 1. Stereodynamics of Gas-Phase Collisions Measurement of vector properties (the stereodynamics) of gas-phase collisions are a sensitive probe of the forces involved. We use a variety of novel spectroscopic techniques to study collisional energy transfer, including polarization spectroscopy, crossed molecular beams with velocity-map imaging and frequency modulated spectroscopy (Figure 1). We interpret the results with the help of quantum scattering calculations, often performed by collaborators in other institutions. Figure 1. CN (A2Pi) prepared with an orientation (preferred sense of rotation). The difference in the signals (the orientation) decreases as collisions with Ar bath gas alter the plane of rotation of the CN. 2. Roaming Atoms and Molecules A new dynamical channel in molecular photodissociations has recently been identified, in which an atomic or molecular fragment ‘roams’ around its partner before reacting to form the products. The signature of a roaming channel appears in the coincident product state distribution. We have recently built a new velocity-map imaging spectrometer (Figure 2), with the aim of identifying how common roaming reactions really are. This work is in collaboration with Dr Dave Townsend (Physics). Figure 2. The newly constructed velocity-map imaging spectrometer. 3. Dynamics at the Gas-Liquid Interface The dynamics of the elementary steps occurring at gas-liquid interfaces has seen very little study, despite their fundamental importance in atmospheric, combustion and other environments. This work, led by Prof Ken McKendrick, studies the inelastic and reactive collisions of OH radicals and oxygen atoms (Figure 3) at surfaces of atmospheric and technological importance. Figure 3. O(3P) atoms are formed by photolysis, fly to the liquid covered surface of a rotating wheel, and the returning OH radicals are probed by laser-induced fluorescence.

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collisions Physics & Astronomy
angular momentum Physics & Astronomy
Ionic Liquids Chemical Compounds
alignment Physics & Astronomy
depolarization Physics & Astronomy
polarization Physics & Astronomy
Atoms Chemical Compounds
scattering Physics & Astronomy

Co Author Network Recent external collaboration on country level. Dive into details by clicking on the dots.

Research Output 1994 2019

Probing Conformational Heterogeneity at the Ionic Liquid–Vacuum Interface by Reactive-Atom Scattering

Smoll, E. J., Purcell, S. M., D’Andrea, L., Slattery, J. M., Bruce, D. W., Costen, M. L., McKendrick, K. G. & Minton, T. K., 17 Jan 2019, In : Journal of Physical Chemistry Letters. 10, 2, p. 156-163 8 p.

Research output: Contribution to journalArticle

Ionic Liquids
Vacuum
Scattering
Atoms
Liquids

Collision-Energy Dependence of the Uptake of Hydroxyl Radicals at Atmospherically Relevant Liquid Surfaces

Bianchini, R., Tesa-Serrate, M. A., Costen, M. L. & McKendrick, K. G., 29 Mar 2018, In : Journal of Physical Chemistry C. 122, 12, p. 6648-6660 13 p.

Research output: Contribution to journalArticle

Open Access
File
hydroxyl radical
collision
liquid
energy
alkane

Determining the Composition of the Vacuum-Liquid Interface in Ionic-Liquid Mixtures

Smoll, E. J., Tesa-Serrate, M. A., Purcell, S., D'Andrea, L., Bruce, D. W., Slattery, J. M., Costen, M. L., Minton, T. K. & McKendrick, K. G., 1 Jan 2018, In : Faraday Discussions. 206, p. 497-522 26 p.

Research output: Contribution to journalArticle

Open Access
File
Ionic Liquids
Fluorescence
Vacuum
Scattering
Surface tension

Non-intuitive rotational reorientation in collisions of NO(A 2Σ+) with Ne from direct measurement of a four-vector correlation

Sharples, T. R., Leng, J. G., Luxford, T. F. M., McKendrick, K. G., Jambrina, P. G., Aoiz, F. J., Chandler, D. & Costen, M. L., 27 Aug 2018, In : Nature Chemistry. 6 p.

Research output: Contribution to journalArticle

Open Access
File
molecular collisions
retraining
handedness
Angular momentum
Scattering

Nanosegregation and Structuring in the Bulk and at the Surface of Ionic-Liquid Mixtures

Bruce, D. W., Cabry, C. P., Nuno Canongia Lopes, J., Costen, M. L., D'Andrea, L., Grillo, I., Marshall, B. C., McKendrick, K. G., Minton, T. K., Purcell, S. M., Rogers, S., Slattery, J. M., Shimizu, K., Smoll, E. & Tesa-Serrate, M. A., 22 Jun 2017, In : Journal of Physical Chemistry B. 121, 24, p. 6002–6020 19 p.

Research output: Contribution to journalArticle

Open Access
File
Ionic Liquids
Molecular dynamics
Chemical analysis
Ions
Imides

Activities 2015 2018

  • 4 Invited talk
  • 1 Oral presentation

Real-Space LIF Imaging of Gas-Liquid Interfacial Scattering

Costen, M. L. (Speaker)
28 Aug 2018

Activity: Talk or presentationOral presentation

Inelastic and Reactive Scattering at Gas-Liquid Interfaces

Costen, M. L. (Speaker)
26 Jul 2018

Activity: Talk or presentationInvited talk

Polarization Resolved Stereodynamics in RET of NO(A2Σ+)

Costen, M. L. (Speaker)
11 Aug 2016

Activity: Talk or presentationInvited talk

Dynamics of Reactive and Inelastic Scattering at the Gas-Liquid Interface

Costen, M. L. (Speaker)
4 Aug 2015

Activity: Talk or presentationInvited talk