Publication details for Prof. Jan R.R. VerletBull, James N. & Verlet, Jan R. R. (2017). Dynamics of π*-resonances in anionic clusters of para-toluquinone. Physical Chemistry Chemical Physics 19(39): 26589-26595.
- Publication type: Journal Article
- ISSN/ISBN: 1463-9076 (print), 1463-9084 (electronic)
- DOI: 10.1039/C7CP03628K
- Further publication details on publisher web site
- Durham Research Online (DRO) - may include full text
Author(s) from Durham
Frequency-resolved photoelectron spectroscopy applied to mass-selected cluster anions is an insightful approach to characterise the dynamics of π*-resonances with microsolvation. Here, the technique is demonstrated with monomer, dimer and trimer radical anions of para-toluquinone (pTQ) over a ∼1 eV excitation window above the detachment threshold. The pTQ− spectra show similar resonances and dynamics to para-benzoquinone, a prototype electrophore. The dimer, (pTQ)2−, has a π-stacked geometry and shows a competition between photodissociation and prompt autodetachment. The trimer, (pTQ)3−, also has a π-stacked cluster geometry and shows vibrational autodetachment from a non-valence state up to ∼0.7 eV above-threshold, outcompeting dissociation. At higher photoexcitation energies, (pTQ)3− shows monomer-like dynamics, blue-shifted in photoexcitation energy by the cluster cohesion energy. Overall, the study highlights the variety of non-adiabatic dynamics available to π*-resonances and the profound changes that occur through clusterization with one and two monomers.