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Photoelectron spectroscopy of para-benzoquinone cluster anions.

Mensa-Bonsu, Golda and Wilson, Mark R. and Tozer, David J. and Verlet, Jan R. R. (2019) 'Photoelectron spectroscopy of para-benzoquinone cluster anions.', Journal of chemical physics., 151 (20). p. 204302.


The photoelectron spectra of para-benzoquinone radical cluster anions, (pBQ)n− (n = 2–4), taken at hv = 4.00 eV are presented and compared with the photoelectron spectrum of the monomer (n = 1). For all clusters, a direct detachment peak can be identified, and the incremental increase in the vertical detachment energy of ∼0.4 eV n−1 predominantly reflects the increase in cohesion energy as the cluster size increases. For all clusters, excitation also leads to low energy electrons that are produced by thermionic emission from ground electronic state anionic species, indicating that resonances are excited at this photon energy. For n = 3 and 4, photoelectron features at lower binding energy are observed which can be assigned to photodetachment from pBQ− for n = 3 and both pBQ− and (pBQ)2− for n = 4. These observations indicate that the cluster dissociates on the time scale of the laser pulse (∼5 ns). The present results are discussed in the context of related quinone cluster anions.

Item Type:Article
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Publisher statement:© 2019 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Mensa-Bonsu, Golda, Wilson, Mark R., Tozer, David J. & Verlet, Jan R. R. (2019). Photoelectron spectroscopy of para-benzoquinone cluster anions. The Journal of Chemical Physics 151(20): 204302 and may be found at
Date accepted:11 November 2019
Date deposited:10 December 2019
Date of first online publication:26 November 2019
Date first made open access:16 December 2019

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