Resonances of the anthracenyl anion probed by frequency-resolved photoelectron imaging of collision-induced dissociated anthracene carboxylic acid

Abstract

The use of CID and photoelectron spectroscopy of organic carboxylic acid anions is discussed as a route to studying the dynamics of resonances in polyaromatic hydrocarbon (PAH) anions.

Chromophores of chromophores: a bottom-up Hückel picture of the excited states of photoactive proteins

“…40,41 Briefly, electrospray ionisation was used to produce deprotonated anions from ~1 mM solutions of phenol, p- 42 by an ion trap at the end of the ion guides. Mass-selected ion packets were then irradiated by a tunable ~6 ns laser pulse from a Nd:YAG pumped optical parametric oscillator (Continuum Surelite II-10, Horizon I), and photoelectrons produced were imaged using a velocity-mapimaging assembly.…”

Sensitivity of Photoelectron Angular Distributions to Molecular Conformations of Anions

“…The pCA anion underwent collisional induced dissociation to lose CO 2 and form pVP -in the ion guide ,which were then rethermalized and mass-selected. 19 Initial density functional theory (DFT) calculations were used to optimize the geometries of the ground states of the neutral and anion using the QChem 4.4 package. 45 Geometries were confirmed to be energetic minima by vibrational frequency analysis.…”

Dynamics of π*-resonances in anionic clusters of para-toluquinone

“…5,6 Over the past few years, the rich non-adiabatic coupling and dynamics between anionic excited states of both valence and non-valence type and the detachment continuum have been conveniently explored using time-resolved and frequency-resolved photoelectron imaging. [7][8][9][10][11][12][13] Advancing an understanding of resonance dynamics in an interacting or condensed phase environment can be approached by studying the evolution of dynamics from the isolated anion (gas-phase) to the anion embedded in a cluster.…”

“…7,9,21 Resonances are quasi-bound excited states embedded in the detachment continuum that form temporary anions through a combination of electron exchange, polarization, and centrifugal forces. The frequency-resolved spectra typically have contributions from multiple electron detachment channels: [7][8][9][10][11][12][13] (i) direct photodetachment corresponding to instantaneous electron ejection; (ii) prompt autodetachment, in which a resonance is photoexcited and promptly autodetaches the excess electron before significant nuclear rearrangement occurs; (iii) delayed autodetachment (DA), where an initial photoexcited resonance is populated for a longer duration before autodetaching or internally converting to a lower-lying resonance that subsequently autodetaches; (iv) vibrational autodetachment (VAD) from a valence or non-valence excited state; and (v) thermionic emission (TE), in which a vibrationally-hot but ground electronic state statistically ejects an electron on the nanosecond to microsecond timescale. The direct photodetachment and prompt autodetachment contributions, (i) and (ii), are jointly referred to as prompt detachment (PD), and are indistinguishable in the frequency-resolved spectrum, although can be inferred through their photoelectron angular distributions.…”