Our research

A Brief Overview

The research conducted by the group encompasses several different fields. Our lab currently contains 4 seperate experiments each involved in one of our key focus areas. These experiments fall under three main categories:
A panorama of B2
                  in the CRL, Oxford.
A panorama of the lab B2 in the Chemistry Research Laboratory. This laboratory is home to our group's experiments.

Reaction Dynamics

Our research in reaction dynamics is currently focussed on state-selected inelastic scattering.

End on images
End on ISA

Experimental and QM simulated images for the N- and O-end orientations (first/second, and third/fourth row, respectively) for the final rotational states between 3.5e and 16.5e.
The Integral Steric Asymmetry (ISA) for end-on collisions is plotted as a function of the final rotational state, j'. A positive ISA indicates a preference for N-end collisions, while a negative ISA indicates a preference for O-end collisions. The QM calculations reproduce the experimental data very well, whereas the quasi-classical (QCT) calculations fail to capture the alternation in the sign of the ISA for adjacent j' transitions.

Photoinduced Dynamics

Our experiments in Photoinduced Dynamics are split into three different sub areas, described below.

CH2BrI
                  TR-CEI
CH2ClI Time Resolved Covariance
The delay dependent kinetic energy of the I+ fragment following photodissociation and Coulomb explosion of CH2BrI. The measured kinetic energy decreases as pump-probe delay increases, due to the increased charge separation at the point of Coulomb explosion

Delay dependent recoil-frame ion-ion covariance maps of CH2Cl+ plotted with respect to I+ following the photodissociation and Coulomb explosion of CH2ClI. The ions recoil at 180 degrees to one another, as required by momentum conservation. Such covariance analysis allows isolation of the desired pump-probe feature (expected radius marked with white crosses) amidst background channels in which the two ions are not formed in coincidence.


Imaging Mass Spectrometry

Reflectron data taken using the PImMS camera
Microscope-mode ion images recorded using the PImMS1 camera on the reflectron instrument. Individual ion images below the mass spectra correspond to the labelled peaks in the recorded mass spectrum, all of which is recorded simultaneously by the PImMS sensor. Here, a spatial resolution of 34μm and a mass resolution(m/Δm) of 1600 is achieved. Using a CCD camera and a photomultiplier tube (PMT) to record the images and mass spectra, respectively, spatial and mass resolutions of 13μm and 8100 have been achieved.

Collaborations

Meet some of our frequent collaborators
An image
                  showing the PImMS II Camera.
Photo of the PImMS II camera, with a timing precision of 12.5ns.

We have many collaborations with theoretical and experimental groups in both the UK and Europe. On ion-imaging and imaging mass spectrometry we collaborate with Professor Andrei Nomerotski, Oxford Physics and Professor Claire Vallance, Oxford Chemistry. On theory, particularly on quasi-classical trajectory and quantum mechanical scattering theory and vector correlations, we have a long-established collaboration with the group of Professor F. Javier Aoiz, Complutense University, Madrid.


Funding

We are grateful to the EU (through an FP7 Training Network, ICONIC), STFC (through a PNPAS award of the RCUK MI-3 programme (Grant No. GR/S85733/01) and Mini-IPS grant ST/J002895/1), and EPSRC (through Programme Grants EP/G00224X/1 and EP/L005913/1) for recent funding. We are currently part of the EPSRC funded Programme Grant Chemical Applications of Velocity and Spatial Imaging.

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