Spin-Orbit Coupling in Orbitally Degenerate States of Aromatic Ions

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Abstract
It is shown that in the orbitally degenerate ground state of the benzene negative ion there is a first‐order electron spin‐orbit interaction associated with the electronic orbital motion around the ring. This first‐order interaction may be as large as a few cm—1 and can give rise to enhanced electron spin‐lattice relaxation in solution even though most of the time the electronic orbital motion is strongly quenched by electrostatic interaction with the solvent.

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