Jahn–Teller effect
E399095
The Jahn–Teller effect is a phenomenon in molecular and solid-state physics where electronically degenerate states cause spontaneous geometric distortions that lower a system’s symmetry and energy.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Jahn-Teller effect | 1 |
| Jahn–Teller distortion | 1 |
| Jahn–Teller effect canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3919315 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Jahn–Teller effect Context triple: [Longuet-Higgins theorem in molecular symmetry, relatesTo, Jahn–Teller effect]
-
A.
Herzberg–Teller approximation
The Herzberg–Teller approximation is a refinement in molecular spectroscopy that accounts for vibronic coupling by allowing electronic transition dipole moments to depend on nuclear coordinates, explaining intensity in otherwise forbidden transitions.
-
B.
Landau–Peierls instability
Landau–Peierls instability is a theoretical prediction in condensed matter physics that shows how long-wavelength thermal fluctuations destroy true long-range positional order in low-dimensional crystalline systems.
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C.
Peierls transition
The Peierls transition is a phase transition in one-dimensional metals where a periodic lattice distortion opens an energy gap at the Fermi surface, turning the system from a metal into an insulator or semiconductor.
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D.
Franck–Condon principle
The Franck–Condon principle is a rule in molecular spectroscopy that explains the intensity distribution of vibronic transitions by assuming electronic transitions occur much faster than nuclear motion, making vertical transitions between vibrational states most probable.
-
E.
Szilard–Chalmers effect
The Szilard–Chalmers effect is a nuclear chemistry phenomenon in which atoms that undergo neutron capture and become radioactive are chemically separated from their original, non-activated atoms due to recoil-induced disruption of their chemical bonds.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Jahn–Teller effect Target entity description: The Jahn–Teller effect is a phenomenon in molecular and solid-state physics where electronically degenerate states cause spontaneous geometric distortions that lower a system’s symmetry and energy.
-
A.
Herzberg–Teller approximation
The Herzberg–Teller approximation is a refinement in molecular spectroscopy that accounts for vibronic coupling by allowing electronic transition dipole moments to depend on nuclear coordinates, explaining intensity in otherwise forbidden transitions.
-
B.
Landau–Peierls instability
Landau–Peierls instability is a theoretical prediction in condensed matter physics that shows how long-wavelength thermal fluctuations destroy true long-range positional order in low-dimensional crystalline systems.
-
C.
Peierls transition
The Peierls transition is a phase transition in one-dimensional metals where a periodic lattice distortion opens an energy gap at the Fermi surface, turning the system from a metal into an insulator or semiconductor.
-
D.
Franck–Condon principle
The Franck–Condon principle is a rule in molecular spectroscopy that explains the intensity distribution of vibronic transitions by assuming electronic transitions occur much faster than nuclear motion, making vertical transitions between vibrational states most probable.
-
E.
Szilard–Chalmers effect
The Szilard–Chalmers effect is a nuclear chemistry phenomenon in which atoms that undergo neutron capture and become radioactive are chemically separated from their original, non-activated atoms due to recoil-induced disruption of their chemical bonds.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
molecular physics concept
ⓘ
physical effect ⓘ solid-state physics concept ⓘ |
| alsoKnownAs |
Jahn–Teller effect
ⓘ
surface form:
Jahn–Teller distortion
|
| appliesTo |
crystal lattices
ⓘ
nonlinear molecules ⓘ octahedral complexes ⓘ tetrahedral complexes ⓘ transition metal complexes ⓘ |
| cause | electronic degeneracy ⓘ |
| consequence |
anisotropy of physical properties
ⓘ
splitting of degenerate electronic energy levels ⓘ |
| describes | spontaneous geometric distortion of molecules or crystals ⓘ |
| doesNotApplyTo | linear molecules ⓘ |
| dynamicVariantInvolves | rapid interconversion between equivalent distorted structures ⓘ |
| effect |
lowering of electronic energy
ⓘ
lowering of molecular symmetry ⓘ |
| example |
distortion of Mn(III) octahedral complexes
ⓘ
elongation of octahedral Cu(II) complexes ⓘ |
| field |
molecular physics
ⓘ
quantum chemistry ⓘ solid-state physics ⓘ |
| governs | distortions of E and T electronic states in high-symmetry environments ⓘ |
| hasVariant |
dynamic Jahn–Teller effect
ⓘ
static Jahn–Teller effect ⓘ |
| holdsFor |
excited electronic states with degeneracy
ⓘ
ground electronic states with degeneracy ⓘ |
| importantFor |
defect centers in crystals
ⓘ
high-temperature superconducting cuprates ⓘ interpretation of electronic spectra ⓘ magnetic properties of transition metal complexes ⓘ properties of perovskite oxides ⓘ structure of coordination compounds ⓘ |
| mathematicalFramework |
group theory
ⓘ
vibronic coupling Hamiltonians ⓘ |
| mechanism | coupling between electronic states and nuclear motions ⓘ |
| namedAfter |
Edward Teller
ⓘ
Hermann Arthur Jahn ⓘ |
| predicts | instability of electronically degenerate states in nonlinear systems ⓘ |
| pseudoVariantInvolves | interaction of nondegenerate but closely spaced electronic states via vibrations ⓘ |
| relatedConcept | pseudo–Jahn–Teller effect ⓘ |
| relatedTo |
crystal field theory
ⓘ
electronic degeneracy ⓘ ligand field theory ⓘ molecular orbital theory ⓘ symmetry breaking ⓘ |
| staticVariantInvolves | fixed distortion at low temperature ⓘ |
| typeOf | vibronic coupling effect ⓘ |
| yearProposed | 1937 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Jahn–Teller effect Description of subject: The Jahn–Teller effect is a phenomenon in molecular and solid-state physics where electronically degenerate states cause spontaneous geometric distortions that lower a system’s symmetry and energy.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Jahn-Teller effect
this entity surface form:
Jahn–Teller distortion