doublet state

https://doi.org/10.1351/goldbook.D01853
A state having a total electron spin quantum number equal to 1/2.
See: multiplicity
Source:
PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2237 (https://doi.org/10.1351/pac199668122223)