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Updated: Jan 19, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
Published on: July 27, 2018
Threshold Photoelectron Spectrum of the Anilino Radical
Helgi Rafn Hrodmarsson1, Gustavo A Garcia1, Laurent Nahon1
1Synchrotron SOLEIL, L'Orme des Merisiers , St Aubin, BP 48 , 91192 Gif sur Yvette , France.
Abstract:
We report on the photoionization of the resonance-stabilized anilino radical (C6H5NH) formed by H atom abstraction from aniline by F atoms in a flow tube. The spectra were recorded from 7.8 to 9.7 eV by using a double-imaging photoelectron/photoion coincidence spectrometer with VUV radiation provided by the DESIRS beamline at the SOLEIL synchrotron. The vibrationally resolved recorded threshold photoelectron spectrum of the anilino radical showed transitions to the ground X+1A' ← X2A″ and first excited states a+3A″ ← X2A″ of the cation, which were assigned through comparison with theoretically simulated spectra, yielding an adiabatic ionization energy of 8.02 ± 0.02 eV. These results are discussed in light of existing data on the picolyl structural isomers and are of interest for the analytical applications of coincidence techniques in real-time combustion analysis where these intermediates are found.
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