Two ‘firsts’ for CTAMOP researchers
Last updated May 29, 2017 by Andrew Brown
Two young researchers in CTAMOP have had their first papers published in the prestigious Phys. Rev. A journal. Rian Morgan and Hector Rey are both PhD students working with Prof. Hugo van der Hart on applications of the R-matrix with time-dependence (RMT) approach to intense laser matter interactions. Hector’s paper (follow this link) extends the RMT approach to investigate photoionisation of ground state atomic carbon with non-zero orbital magnetic quantum number: “We focus on how spin-orbit coupling modifies the ejected electron momentum distributions for ML = 0 and ML = 1. It has been found that both 2p and 2s electrons can be ejected during multiphoton ionisation, but for ML = 0 the emission of 2p electron can only occur at an angle to the laser polarisation axis. This provides us with a means of modelling the spin orbit dynamics. Our theoretical results are in good agreement with available experimental findings based on multiphoton ionisation of C following photodetachment of C-.” Rian’s paper (follow this link)focusses on two colour photoionisation of Ne+: “Varying the time-delay between the XUV and NIR pulses we observe modulations in the overall ionisation yield. These modulations can be attributed to population trapping in low lying Rydberg states with different states being populated at different delay times. The modulations can be attributed to the action of multiple electrons: a key aspect of the RMT approach. If the XUV pulse begins early in the IR pulse the modulations can be attributed to 3s electrons; when the XUV pulse occurs in the middle of the IR pulse the main contributors are from 3p electrons and finally 3d electrons play a significant role when the XUV pulse occurs at the end of the IR pulse.”
We are a Research Cluster of the School of Mathematics and Physics at Queen’s University Belfast in Northern Ireland. Our research interests are focused primarily on computational and theoretical physics.
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