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Ultrafast relaxation dynamics observed through time-resolved photoelectron angular distributions.

Lecointre, J. M. and Roberts, G. M. and Horke, D. A. and Verlet, J. R. R. (2010) 'Ultrafast relaxation dynamics observed through time-resolved photoelectron angular distributions.', Journal of physical chemistry A., 114 (42). pp. 11216-11224.


Time-resolved photoelectron imaging of the 7,7,8,8-tetracyanoquinodimethane (TCNQ) radical anion is presented. Photoelectron angular distributions (PADs) are qualitatively analyzed in terms of the simple s-p model that is based on symmetry arguments. The internal conversion dynamics from the first excited state (12B3u) to the ground state (2B2g) may be observed through temporal changes in the PADs of the spectrally overlapping photoelectron features arising from photodetachment of the ground state and the excited state. A formulism for extracting the population dynamics from the β2 anisotropy parameter of overlapping spectroscopic features is presented. This is used to extract the lifetime of the first excited state, which is in good agreement with that observed in the time-resolved photoelectron spectra.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Publisher statement:This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry A, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Date accepted:No date available
Date deposited:05 February 2016
Date of first online publication:October 2010
Date first made open access:No date available

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