Ultrafast Relaxation Dynamics Observed Through Time-Resolved Photoelectron Angular Distributions

Lecointre, J.M.; Roberts, G.M.; Horke, D.A.; Verlet, J.R.R.

Abstract

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.

Citation

Lecointre, J., Roberts, G., Horke, D., & Verlet, J. (2010). Ultrafast Relaxation Dynamics Observed Through Time-Resolved Photoelectron Angular Distributions. The Journal of Physical Chemistry A, 114(42), 11216-11224. https://doi.org/10.1021/jp1028855

• Journal Article Type: Article
• Publication Date: Oct 28, 2010
• Deposit Date: Jan 28, 2016
• Publicly Available Date: Feb 5, 2016
• Journal: The Journal of Physical Chemistry A
• Print ISSN: 1089-5639
• Electronic ISSN: 1520-5215
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 114
• Issue: 42
• Pages: 11216-11224
• DOI: https://doi.org/10.1021/jp1028855
• Public URL: https://durham-repository.worktribe.com/output/1421716