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Issue 37, 2020
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High-resolution vacuum ultraviolet photodynamic of the nitrogen dioxide dimer (NO2)2 and the stability of its cation

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Abstract

We report a comprehensive vacuum ultraviolet (VUV) photoionization study of the nitrogen dioxide dimer (NO2)2 by using a state-of-the-art method of double imaging photoelectron photoion coincidence (i2PEPICO) spectroscopy at synchrotron SOLEIL. We find that the dimer cation N2O4+ from direct ionization of (NO2)2 is not stable and fully dissociates into the NO2+ and NO2 fragments. After identifying and separating the two different sources of NO2+ cations observed in experiments, direct photoionization of the monomer NO2 and dissociative photoionization of the co-existing dimer (NO2)2, the pure mass-selected threshold photoelectron spectrum (TPES) of the dimer (NO2)2 has been recorded without the need of subtraction. An upper limit of the adiabatic ionization energy of the dimer (AIE ≤ 9.59 ± 0.05 eV) and the appearance energy of the NO2+ fragment (AE = 10.15 ± 0.05 eV) are also given. In addition, the state-selected dynamics of the five low-lying electronic states of the cation N2O4+ have been analyzed from the corresponding kinetic energy release distributions.

Graphical abstract: High-resolution vacuum ultraviolet photodynamic of the nitrogen dioxide dimer (NO2)2 and the stability of its cation

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Article information


Submitted
30 Jun 2020
Accepted
11 Sep 2020
First published
11 Sep 2020

Phys. Chem. Chem. Phys., 2020,22, 21068-21073
Article type
Paper

High-resolution vacuum ultraviolet photodynamic of the nitrogen dioxide dimer (NO2)2 and the stability of its cation

X. Tang, G. A. Garcia and L. Nahon, Phys. Chem. Chem. Phys., 2020, 22, 21068
DOI: 10.1039/D0CP03495A

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