We probe resonances (transient anions) in nitrobenzene with the focus on the electron emission from these. Experimentally, we populate resonances in two ways: either by the impact of free electrons on the neutral molecule or by the photoexcitation of the bound molecular anion. These two excitation means lead to transient anions in different initial geometries. In both cases, the anions decay by electron emission and we record the electron spectra. Several types of emission are recognized, differing by the way in which the resulting molecule is vibrationally excited. In the excitation of specific vibrational modes, distinctly different modes are visible in electron collision and photodetachment experiments. The unspecific vibrational excitation, which leads to the emission of thermal electrons following the internal vibrational redistribution, shows similar features in both experiments. A model for the thermal emission based on a detailed balance principle agrees with the experimental findings very well. Finally, a similar behavior in the two experiments is also observed for a third type of electron emission, the vibrational autodetachment, which yields electrons with constant final energies over a broad range of excitation energies. The entrance channels for the vibrational autodetachment are examined in detail, and they point to a new mechanism involving a reverse valence to non-valence internal conversion.
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14 August 2022
Research Article|
August 08 2022
Resonances in nitrobenzene probed by the electron attachment to neutral and by the photodetachment from anion
Miloš Ranković
;
Miloš Ranković
(Data curation, Investigation, Writing – review & editing)
1
J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences
, Dolejškova 3, 18223 Prague, Czech Republic
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Pamir Nag
;
Pamir Nag
(Data curation, Formal analysis)
1
J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences
, Dolejškova 3, 18223 Prague, Czech Republic
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Cate S. Anstöter
;
Cate S. Anstöter
(Data curation, Formal analysis)
2
Department of Chemistry, Durham University
, Durham DH1 3LE, United Kingdom
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Golda Mensa-Bonsu
;
Golda Mensa-Bonsu
(Data curation, Formal analysis)
2
Department of Chemistry, Durham University
, Durham DH1 3LE, United Kingdom
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Ragesh Kumar T. P.
;
Ragesh Kumar T. P.
(Data curation, Formal analysis)
1
J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences
, Dolejškova 3, 18223 Prague, Czech Republic
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Jan R. R. Verlet
;
Jan R. R. Verlet
a)
(Conceptualization, Supervision, Writing – original draft)
2
Department of Chemistry, Durham University
, Durham DH1 3LE, United Kingdom
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Juraj Fedor
Juraj Fedor
a)
(Conceptualization, Writing – original draft)
1
J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences
, Dolejškova 3, 18223 Prague, Czech Republic
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J. Chem. Phys. 157, 064302 (2022)
Article history
Received:
May 31 2022
Accepted:
July 15 2022
Citation
Miloš Ranković, Pamir Nag, Cate S. Anstöter, Golda Mensa-Bonsu, Ragesh Kumar T. P., Jan R. R. Verlet, Juraj Fedor; Resonances in nitrobenzene probed by the electron attachment to neutral and by the photodetachment from anion. J. Chem. Phys. 14 August 2022; 157 (6): 064302. https://doi.org/10.1063/5.0101358
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