- Singlet state
theoretical physics, a singlet usually refers to a one-dimensional representation (e.g. a particle with vanishing spin). It may also refer to two or more particles prepared in a correlated state, such that the total angular momentum of the state is zero.
Singlets frequently occur in
atomic physicsas one of the two ways in which the spin of two electrons can be combined; the other being a triplet. A single electron has spin 1/2, and transforms as a doublet, that is, as the fundamental representationof the rotation group SU(2). The product of two doublet representations can be decomposed into the sum of the adjoint representation(the triplet) and the trivial representation, the singlet. More prosaically, a pair of electron spins can be combined to form a state of total spin 1 and a state of spin 0.
The singlet state formed from a pair of electrons has many peculiar properties, and plays a fundamental role in the
EPR paradoxand quantum entanglement. In Dirac notation this EPR state is usually represented as:
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singlet state — singletinė būsena statusas T sritis chemija apibrėžtis Molekulės būsena, kuriai esant vienos arba kelių orbitalių elektronų sukinių suma lygi nuliui. atitikmenys: angl. singlet state rus. синглетное состояние … Chemijos terminų aiškinamasis žodynas
singlet state — vienlypė būsena statusas T sritis fizika atitikmenys: angl. singlet state vok. Singulettzustand, m rus. синглетное состояние, n pranc. état singulet, m … Fizikos terminų žodynas
singlet state — the excited state occurring when one electron of a pair is excited to a higher energy level without changing its spin; it is unstable and can decay to either a ground state or a triplet state … Medical dictionary
Singlet oxygen — is the common name used for the two metastable states of molecular oxygen (O2) with higher energy than the ground state triplet oxygen [cite journal title = Physical and chemical properties of singlet molecular oxygen author = David R. Kearns… … Wikipedia
Singlet — may refer to: * singlet state, in theoretical physics, a quantum state with zero spin * in spectroscopy, an entity appearing as a single peak; see NMR spectroscopy * in optics, a single lens element, the building blocks of lens systems; see lens… … Wikipedia
state — A condition, situation, or status. [L. status, condition, s.] absent s. SYN: dreamy s.. activated s. SYN: excited s.. anxiety tension s. a milder form of an anxiety disorder. See anxiety disorders, under disorder … Medical dictionary
singlet oxygen — a highly reactive, dimagnetic, excited state (1O2) of dioxygen that rapidly decays with the emission of visible light to the paramagnetic (triplet) ground state. Singlet oxygen is thought to be involved in the oxidative killing of ingested… … Medical dictionary
singlet — noun Date: circa 1746 1. [from its having only one thickness of cloth] chiefly British an athletic jersey; also undershirt 2. an atom or molecule that has no net electronic magnetic moment; also an excited state of an atom or molecule that is a… … New Collegiate Dictionary
singlet oxygen — noun a metastable state of molecular oxygen that has a slightly higher energy than normal triplet oxygen, and is more chemically reactive … Wiktionary
singlet — noun 1》 chiefly Brit. a vest or similar sleeveless garment. 2》 Physics a single line in a spectrum, not part of a multiplet. 3》 Physics a state or energy level with zero spin, giving a single value for a particular quantum number. Origin C18… … English new terms dictionary