The triplet state has a longer bond length than the singlet state.
The triplet state of C does follow this trend.
This reduces the lifetime of the triplet state, therefore phosphorescence is readily observed.
Excited triplet states used to study biological macromolecules at room temperature.
For most carbenes, the triplet state is more stable than the corresponding singlet.
Through intersystem crossing the triplet state can be obtained.
It crosses from the S state into the triplet state with nearly 100% yield.
Within a microsecond, or less, the molecules will change to their triplet state.
The population of triplet states is also possible by other means.
A multiplicative term is added to the autocorrelation to account for the triplet state.