title: Internal conversion outcompetes autodetachment from resonances in the deprotonated tetracene anion continuum.
abstract: Photoelectron velocity-map imaging and electronic structure calculations have been used to study the temporary anion (resonance) dynamics of the closed-shell site-specific deprotonated tetracene anion (C18H11(-)) in the hv = 3.26 eV (380 nm) to 4.13 eV (300 nm) range. In accord with a recent frequency-, angle-, and time-resolved photoelectron imaging study on a related but open-shell polyaromatic radical anion (Chem. Sci., 2015, 6, 1578-1589), population of π*-resonances situated in the detachment continuum efficiently recover the ground electronic state of the anion through ultrafast non-adiabatic dynamics, followed by characteristic statistical electron loss (thermionic emission). The combined electron yield of direct photodetachment and autodetachment from the optically-accessed resonances in C18H11(-) is several orders of magnitude smaller than thermionic emission from the ground electronic electronic state in the photon energy range studied. This result implies a resilience to prompt photoejection from UV radiation, and the ability of neutral PAH-like species to capture a free electron and form a long-lived molecular anion that ultimately decays by thermionic emission on a millisecond timescale. The attachment mechanism applies to polyaromatic species that cannot support dipole-bound states, and may provide an additional route to forming anions in astrochemical environments.
authors.affiliation: Department of Chemistry, Durham University, South Road, DH1 3LE, Durham, UK. j.r.r.verlet@durham.ac.uk.
authors.forename: James N
authors.initials: JN
authors.lastname: Bull
authors.forename: Christopher W
authors.initials: CW
authors.lastname: West
authors.forename: Jan R R
authors.initials: JR
authors.lastname: Verlet