positronium
E761922
Positronium is an exotic, hydrogen-like atom consisting of an electron and its antiparticle, a positron, bound together before they annihilate into photons.
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
bosonic system
ⓘ
exotic atom ⓘ hydrogen-like atom ⓘ |
| analogousTo | hydrogen atom ⓘ |
| annihilatesInto | photons ⓘ |
| bindingEnergyRelativeToHydrogen | half the binding energy of hydrogen ⓘ |
| bindingInteraction | electromagnetic interaction ⓘ |
| BohrRadiusRelativeToHydrogen | twice the Bohr radius of hydrogen ⓘ |
| canFormIn |
biological tissue
ⓘ
gases ⓘ liquids ⓘ solids ⓘ vacuum ⓘ |
| composedOf |
electron
ⓘ
positron ⓘ |
| discoveredBy | Martin Deutsch NERFINISHED ⓘ |
| discoveryYear | 1951 ⓘ |
| governedBy | quantum electrodynamics NERFINISHED ⓘ |
| hasElectricCharge | 0 ⓘ |
| hasExcitedStates |
2P
ⓘ
2S ⓘ |
| hasGroundState | 1S ⓘ |
| hasQuantumNumber |
magnetic quantum number m
ⓘ
orbital angular momentum l ⓘ principal quantum number n ⓘ total angular momentum J ⓘ total spin S ⓘ |
| hasReducedMass | half the electron mass ⓘ |
| hasSpectralLinesSimilarTo | hydrogen spectral lines ⓘ |
| hasSpinConfiguration |
ortho-positronium
ⓘ
para-positronium NERFINISHED ⓘ |
| hasTotalMass | approximately twice the electron mass ⓘ |
| isBoundStateOf | electron and positron ⓘ |
| isElectricallyNeutral | true ⓘ |
| isMetastable | true ⓘ |
| lifetimeAffectedBy | surrounding medium ⓘ |
| lifetimeDependsOn | spin state ⓘ |
| orthoPositroniumDecayProducts | three gamma photons ⓘ |
| orthoPositroniumLifetimeInVacuum | about 142 nanoseconds ⓘ |
| orthoPositroniumSpin | triplet (total spin 1) ⓘ |
| paraPositroniumDecayProducts | two gamma photons ⓘ |
| paraPositroniumLifetimeInVacuum | about 125 picoseconds ⓘ |
| paraPositroniumSpin | singlet (total spin 0) ⓘ |
| relevantTo | positron emission tomography ⓘ |
| studiedIn | positron annihilation spectroscopy ⓘ |
| usedIn |
fundamental symmetry tests
ⓘ
materials porosity studies ⓘ |
| usedToTest | quantum electrodynamics predictions ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.