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Updated: Feb 18, 2026

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
Published on: May 29, 2018
Using time-resolved photoelectron spectroscopy to unravel the electronic relaxation dynamics of photoexcited
Helen H Fielding1, Graham A Worth1
1Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK. h.h.fielding@ucl.ac.uk g.a.worth@ucl.ac.uk.
Abstract:
Time-resolved photoelectron spectroscopy measurements combined with quantum chemistry and dynamics calculations allow unprecedented insight into the electronic relaxation mechanisms of photoexcited molecules in the gas-phase. In this Tutorial Review, we explain the essential concepts linking photoelectron spectroscopy measurements with electronic structure and how key features on the potential energy landscape are identified using quantum chemistry and quantum dynamics calculations. We illustrate how time-resolved photoelectron spectroscopy and theory work together using examples ranging in complexity from the prototypical organic molecule benzene to a pyrrole dimer bound by a weak N-Hπ interaction and the green fluorescent protein chromophore.
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