open-shell systems
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https://doi.org/10.1351/goldbook.OT07087
Atomic or molecular systems in which the electrons are not completely assigned to orbitals in pairs.
Source:
PAC, 1999,
71
, 1919. 'Glossary of terms used in theoretical organic chemistry' on page 1956 (https://doi.org/10.1351/pac199971101919)