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Photoelectron spectroscopy of the hexafluorobenzene cluster anions: (C6F6)n– (n = 1–5) and I–(C6F6).

Rogers, Joshua P. and Anstöter, Cate Sara and Bull, James N and Curchod, Basile F. E. and Verlet, Jan R. R. (2019) 'Photoelectron spectroscopy of the hexafluorobenzene cluster anions: (C6F6)n– (n = 1–5) and I–(C6F6).', Journal of physical chemistry A., 123 (8). pp. 1602-1612.

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.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1021/acs.jpca.8b11627
Publisher statement:This document is the Accepted Manuscript version of a Published Work that appeared in final form in 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 https://doi.org/10.1021/acs.jpca.8b11627
Date accepted:29 January 2019
Date deposited:31 January 2019
Date of first online publication:29 January 2019
Date first made open access:29 January 2020

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