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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The propyl gallate is widely used as a triplet state quencher.
The increase in the energy gap between [S.sub.2] and [S.sub.1] due to solvent relaxation, observed for rubrofusarin, minimizes the influence of [S.sub.2] (n,[[pi].sup.*]) on [S.sub.1] ([pi],[[pi].sup.*]), favoring the population of [T.sub.1] for rubrofusarin (Figures 8C and D) due to the occurrence of favorable conditions for intersystem crossing between [S.sub.1] and [T.sub.3] and the significant increase in energy between [S.sub.1] and the adjacent triplet state ([DELTA]E([S.sub.1],[T.sub.3]) = 57.65 kJ [mol.sup.- 1]).
Furthermore, steady-state photo-induced absorption spectroscopy showed the presence of positive polarons at 1350 nm and triplet states at 1100 nm (see Figure 2), the latter indicating triplet state formation via charge transfer states [14].
While the formation of triplet state (instead of singlet ones) is not desired in the typical applications of chemi-/bioluminescence, such states can have important roles in other applications.
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 singlet oxygen can be produced through the energy transfer process from the triplet state of the photosensitizer to the triplet oxygen molecules [2].
Therefore, in the first step, the sulfur atom in triplet state, [sup.3]S, excited to the singlet state, and the reaction can continue in the singlet state This is explained as follows.
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.