Electron-molecule resonances of anthracene were probed by 2D photoelectron imaging of the corresponding radical anion up to 3.7 eV in the continuum. A number of resonances were observed in both the photoelectron spectra and angular distributions, and most resonances showed clear autodetachment dynamics. The resonances were assigned using density functional theory calculations and are consistent with the available literature. Competition between direct and autodetachment, as well as signatures of internal conversion between resonances, was observed for some resonances. For the 12B2g resonance, a small fraction of population recovers the ground electronic state as evidenced by thermionic emission. Recovery of the ground electronic state offers a route of producing anions in an electron–molecule reaction; however, the energy at which this occurs suggests that anthracene anions cannot be formed in the interstellar medium by electron capture through this resonance.
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7 May 2020
Research Article|
May 04 2020
Low energy electron impact resonances of anthracene probed by 2D photoelectron imaging of its radical anion
Golda Mensa-Bonsu
;
Golda Mensa-Bonsu
Department of Chemistry, Durham University
, Durham DH1 3LE, United Kingdom
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Aude Lietard
;
Aude Lietard
Department of Chemistry, Durham University
, Durham DH1 3LE, United Kingdom
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David J. Tozer
;
David J. Tozer
Department of Chemistry, Durham University
, Durham DH1 3LE, United Kingdom
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Jan R. R. Verlet
Jan R. R. Verlet
a)
Department of Chemistry, Durham University
, Durham DH1 3LE, United Kingdom
a)Author to whom correspondence should be addressed: j.r.r.verlet@durham.ac.uk
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a)Author to whom correspondence should be addressed: j.r.r.verlet@durham.ac.uk
J. Chem. Phys. 152, 174303 (2020)
Article history
Received:
March 13 2020
Accepted:
April 12 2020
Citation
Golda Mensa-Bonsu, Aude Lietard, David J. Tozer, Jan R. R. Verlet; Low energy electron impact resonances of anthracene probed by 2D photoelectron imaging of its radical anion. J. Chem. Phys. 7 May 2020; 152 (17): 174303. https://doi.org/10.1063/5.0007470
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