Electronic structure of the para-dinitrobenzene radical anion: a combined 2D photoelectron imaging and computational study

Physical Chemistry Chemical Physics : PCCP
Cate S AnstöterJan R R Verlet

Abstract

The para-dinitrobenzene radical anion has been studied by 2D photoelectron imaging within the energy range of 2.5 eV above the detachment threshold. Supporting electronic structure calculations at the XMCQDPT2 level of the excited states and resonances are presented. The direct photodetachment channel has been observed and modelled, and yields an electron affinity of 1.99 ± 0.01 eV. In addition to the direct channel, evidence of resonances is observed. These resonances, which are symmetry allowed for photoexcitation from the ground state and of Feshbach types with respect to the open continuum, result in fast internal conversion to bound electronic states, followed by statistical electron emission observed at very low kinetic energies as well as dissociation of the nitrite anion. The latter is seen in the photoelectron spectra, which can be modelled as a combination of direct detachment from the para-dinitrobenzene and nitrite anions. An additional dimension has been offered by the 2D photoelectron angular distribution that is particularly sensitive to a mechanism of electron detachment, allowing us to confidently interpret the production of the nitrite anion photofragment.

References

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Jun 2, 2015·Physical Chemistry Chemical Physics : PCCP·James N BullJan R R Verlet
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May 5, 2017·The Journal of Physical Chemistry Letters·Cate S AnstöterJan R R Verlet
May 17, 2017·Chemical Science·Anastasia V BochenkovaHelen H Fielding
Jun 1, 2017·Science Advances·James N Bull, Jan R R Verlet
Sep 25, 2017·Physical Chemistry Chemical Physics : PCCP·Cate S AnstöterJan R R Verlet
Apr 26, 2018·The Journal of Physical Chemistry Letters·Joshua P RogersJan R R Verlet

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Citations

Sep 26, 2019·Physical Chemistry Chemical Physics : PCCP·Golda Mensa-BonsuJan R R Verlet
Nov 30, 2019·The Journal of Chemical Physics·Golda Mensa-BonsuJan R R Verlet
May 10, 2020·The Journal of Chemical Physics·Golda Mensa-BonsuJan R R Verlet
May 28, 2021·The Journal of Physical Chemistry. a·Cate S Anstöter, Jan R R Verlet
Aug 10, 2021·The Journal of Physical Chemistry. a·Aude LietardKenneth D Jordan
Apr 3, 2020·The Journal of Physical Chemistry. a·Jan R R VerletJoshua P Rogers
Jan 6, 2022·Physical Chemistry Chemical Physics : PCCP·Cate S AnstöterJan R R Verlet

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Methods Mentioned

BETA
electron impact

Software Mentioned

ezDyson
QChem
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