What Is a Triple Tag?
The triplet state is the quantum state of a system with a spin of 1, so that there are three allowed spin components: -1,0 and +1. The molecule is in an excited triplet state, that is, the molecule contains two spin-unpaired electrons. The multiplicity of the electronic excited state is represented by M = 2s + 1, where s is the algebraic sum of the electron spin quantum numbers, and its value is 0 or 1.
Triplet
discuss
- Chinese name
- Triplet
- Foreign name
- Triplet state
- Symbol
- T
- Related formulas
- M = 2s + 1
- Subject
- physics
- The triplet state is the quantum state of a system with a spin of 1, so that there are three allowed spin components: -1,0 and +1. The molecule is in an excited triplet state, that is, the molecule contains two spin-unpaired electrons. The multiplicity of the electronic excited state is represented by M = 2s + 1, where s is the algebraic sum of the electron spin quantum numbers, and its value is 0 or 1.
- According to the principle of Pauli incompatibility, two electrons occupied by the same orbital in a molecule must have opposite spin directions, that is, spin pairing. If the electrons in all the orbitals of the molecule are spin-paired, that is, s = 0 and the multiplicity of the molecule M = 1, the molecular system is in a singlet state, which is represented by the symbol S. The ground state of most organic molecules is singlet. If the transition of the electron is accompanied by a change in the spin direction, the molecule now has two electrons that are not paired with the spin, that is, parallel spins, s = 1, the multiplicity of the molecule M = 3, and the molecule is at The excited triplet is represented by the symbol T. For unpaired electrons in discrete orbits, parallel spins are more stable than paired spins (Hund's Rule), so triplet energy levels are always slightly lower than corresponding singlet states.
- Triplet-triplet-triplet annihilation: Two atomic or molecular entities in triplet state often interact (usually collide with each other), leaving one of them in an excited singlet state (excitedsinglet state) ), The other is in the ground singlet state [1] . In general, but not necessarily, delayed fluorescence is then produced [1] .
- For a pair of excitons in a molecular crystal, after interacting and annihilating, a singlet exciton will be generated, the singlet exciton will disappear quickly, and a photon (delayed fluorescence) will be generated [2] .