triplet state


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triplet state

[′trip·lət ‚stāt]
(atomic physics)
Electronic state of an atom or molecule whose total spin angular momentum quantum number is equal to 1.
(quantum mechanics)
Any multiplet having three states.
References in periodicals archive ?
The key discovery is that in certain types of coordination complexes based on carbene ligands the excited singlet state sinks below the excited triplet state during molecular rotation.
The photosensitizer can be activated to singlet excited state by visible light absorption and then partial excited-state molecules convert into longer-lived triplet state through intersystem crossing.
The chromophore in an excited triplet state is reduced either by an electron or by a hydrogen transfer from a compound in the environment.
Helium in this case is known as orthohelium (or triplet state helium), emphasizing that its two electrons have spins with the same orientation.
After triplet state excitation, benzophenone is able to abstract hydrogen from ether, amine, alcohol or thiol functional coinitiators, thus reactive centers can be generated on coinitiator molecules to initiate free radical polymerization.
Alternatively, the molecule may convert into an excited triplet state (T) molecule via intersystem crossing that involves a change in the spin of an electron.
Experiments are performed with erythrosine B which has a large intersystem crossing rate to the triplet state.
In phosphorescence, absorbed photon energy crosses into a higher energy state, called a triplet state.
When considering the excited triplet state energies of both ITX and maleic anhydride derivatives (64 and 72 kcal/mol, respectively), photosensitization is highly unlikely since an energy transfer fronot m a lower energy to a higher energy is not thermodynamically favored (2).
Following vibrational relaxation (VR) to the lowest vibrational level of S1, the molecule can either relax to the ground state by releasing heat to the environment through a process called internal conversion (IC) or by emitting light (fluorescence), or undergo intersystem crossing (ISC) to the triplet state.
It is likely that substitution with a nitro group generates a low-lying excited triplet state that reduces the reactivity of these compounds.
The excited/energetic electron cannot relax back into triplet state by itself.