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Updated: Dec 13, 2025

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
Published on: July 27, 2018
Photoelectron spectroscopic study of dipole-bound and valence-bound nitromethane anions formed by Rydberg electron
Gaoxiang Liu1, Sandra M Ciborowski1, Jacob D Graham1
1Department of Chemistry, Johns Hopkins University, 3400 N. Charles Street, Baltimore, Maryland 21218, USA.
Abstract:
Close-lying dipole-bound and valence-bound states in the nitromethane anion make this molecule an ideal system for studying the coupling between these two electronically different states. In this work, dipole-bound and valence-bound nitromethane anions were generated by Rydberg electron transfer and characterized by anion photoelectron spectroscopy. The presence of the dipole-bound state was demonstrated through its photoelectron spectral signature, i.e., a single narrow peak at very low electron binding energy, its strong Rydberg quantum number, n*, dependence, and its relatively large anisotropy parameter, β. This work goes the furthest yet in supporting the doorway model of electron attachment to polar molecules.
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