triplet-triplet transitions
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https://doi.org/10.1351/goldbook.T06507
Electronic transitions in which both the initial and final states are triplet states.
Source:
PAC, 1996,
68
, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2282 (https://doi.org/10.1351/pac199668122223)