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Photoelectron Spectroscopy of the Hexafluorobenzene Cluster Anions: (C₆F₆)<sub>n</sub><sup>−</sup> (n = 1 – 5) and I<sup>−</sup>(C₆F₆)

Rogers, Joshua P.; Anstöter, Cate Sara; Bull, James N; Curchod, Basile F.E.; Verlet, Jan R.R.

Photoelectron Spectroscopy of the Hexafluorobenzene Cluster Anions: (C₆F₆)<sub>n</sub><sup>−</sup> (n = 1 – 5) and I<sup>−</sup>(C₆F₆) Thumbnail


Authors

Joshua P. Rogers

Cate Sara Anstöter

James N Bull



Abstract

Frequency-resolved (2D) photoelectron (PE) spectra of the anionic clusters (C6F6)n–, for n = 1–5, and time-resolved PE spectra of I–C6F6 are presented using a newly built instrument and supported by electronic structure calculations. From the 2D PE spectra, the vertical detachment energy (VDE) of C6F6– was measured to be 1.60 ± 0.01 eV, and the adiabatic detachment energy (ADE) was ≤0.70 eV. The PE spectra also contain fingerprints of resonance dynamics over certain photon energy ranges, in agreement with the calculations. An action spectrum over the lowest resonance is also presented. The 2D spectra of (C6F6)n– show that the cluster can be described as C6F6–(C6F6)n−1. The VDE increases linearly (200 ± 20 meV n–1) due to the stabilizing influence on the anion of the solvating C6F6 molecules. For I–C6F6, action spectra of the absorption just below both detachment channels are presented. Time-resolved PE spectra of I–C6F6 excited at 3.10 eV and probed at 1.55 eV reveal a short-lived nonvalence state of C6F6– that coherently evolves into the valence ground state of the anion and induces vibrational motion along a specific buckling coordinate. Electronic structure calculations along the displacement of this mode show that at the extreme buckling angle the probe can access an excited state of the anion that is bound at that geometry but adiabatically unbound. Hence, slow electrons are emitted and show dynamics that predominantly probe the outer-turning point of the motion. A PE spectrum taken at t = 0 contains a vibrational structure assigned to a specific Raman- or IR-active mode of C6F6.

Citation

Rogers, J. P., Anstöter, C. S., Bull, J. N., Curchod, B. F., & Verlet, J. R. (2019). Photoelectron Spectroscopy of the Hexafluorobenzene Cluster Anions: (C₆F₆)n− (n = 1 – 5) and I−(C₆F₆). The Journal of Physical Chemistry A, 123(8), 1602-1612. https://doi.org/10.1021/acs.jpca.8b11627

Journal Article Type Article
Acceptance Date Jan 29, 2019
Online Publication Date Jan 29, 2019
Publication Date Feb 28, 2019
Deposit Date Jan 31, 2019
Publicly Available Date Jan 29, 2020
Journal The Journal of Physical Chemistry A
Print ISSN 1089-5639
Electronic ISSN 1520-5215
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 123
Issue 8
Pages 1602-1612
DOI https://doi.org/10.1021/acs.jpca.8b11627

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Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of physical chemistry A copyright &copy; American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpca.8b11627





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