Einstein coefficients
E1604
Einstein coefficients are parameters in quantum theory that quantify the probabilities of absorption, spontaneous emission, and stimulated emission of radiation by atoms or molecules.
Observed surface forms (3)
| Surface form | Occurrences |
|---|---|
| Einstein A coefficient | 0 |
| Einstein B coefficient for absorption | 1 |
| Einstein B coefficient for stimulated emission | 0 |
Statements (52)
| Predicate | Object |
|---|---|
| instanceOf |
Einstein coefficient
ⓘ
Einstein coefficient ⓘ Einstein coefficient ⓘ parameter in quantum theory ⓘ physical quantity ⓘ radiative transition coefficient ⓘ |
| appliesTo |
bound–bound transitions in atoms
ⓘ
bound–bound transitions in molecules ⓘ |
| dependsOn |
dipole matrix element
ⓘ
transition frequency ⓘ |
| describes |
radiation absorption
ⓘ
spontaneous emission ⓘ stimulated emission ⓘ |
| hasDimension |
(energy density × time)^{-1}
ⓘ
(energy density × time)^{-1} ⓘ inverse time ⓘ |
| hasPart |
Einstein A coefficient
ⓘ
Einstein coefficients self-linksurface differs ⓘ
surface form:
Einstein B coefficient for absorption
Einstein B coefficient for stimulated emission ⓘ |
| imply | existence of stimulated emission ⓘ |
| introducedBy | Albert Einstein ⓘ |
| introducedIn |
1916
ⓘ
1917 ⓘ |
| namedAfter | Albert Einstein ⓘ |
| relatedTo |
Boltzmann distribution
ⓘ
Planck radiation law ⓘ detailed balance ⓘ oscillator strength ⓘ transition dipole moment ⓘ |
| relates |
absorption rate
ⓘ
energy density of radiation field ⓘ energy density of radiation field ⓘ lower energy level population ⓘ spontaneous emission rate ⓘ stimulated emission rate ⓘ upper energy level population ⓘ upper energy level population ⓘ |
| symbol |
A_21
ⓘ
B_12 ⓘ B_21 ⓘ |
| usedIn |
astrophysics
ⓘ
atomic physics ⓘ laser physics ⓘ molecular physics ⓘ quantum theory of radiation ⓘ radiative transfer theory ⓘ spectroscopy ⓘ statistical mechanics of radiation ⓘ |
| usedToCalculate |
absorption coefficients in radiative transfer
ⓘ
emission coefficients in radiative transfer ⓘ line intensities in spectra ⓘ radiative lifetimes of excited states ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Einstein B coefficient for absorption