tripletní

Tripletní refers to a state in quantum mechanics where a system, typically a molecule or atom, possesses two unpaired electrons with parallel spins. This configuration is a specific type of spin multiplicity, where the total spin angular momentum is not zero. In the case of a triplet state, the spin quantum number S is equal to 1, leading to 2S+1 = 3 possible spin orientations, hence the term "triplet."

Tripletn states are generally of higher energy than the corresponding singlet states, where unpaired electrons have anti-parallel spins (S=0, multiplicity=1). The transition from a ground state singlet to an excited triplet state, or between different triplet states, is often spin-forbidden according to selection rules. This means these transitions occur less frequently and are typically slower than spin-allowed transitions.

The formation and decay of triplet states are crucial in various chemical and physical processes. They play a significant role in photochemistry, phosphorescence (a type of luminescence), and certain catalytic reactions. Understanding the properties and behavior of triplet states is essential for fields such as spectroscopy, materials science, and organic electronics. The term "tripletní" is a direct translation or adaptation of the English term "triplet state" and is commonly used in scientific literature when referring to this quantum mechanical phenomenon.