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Part 1212-32.1

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Part 12: Condensed Matter·60 entries

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Section 12-322 entries

12-32.1relaxation time <condensed matter>12-32.2carrier lifetime <semiconductors>

12-32.1

relaxation time

URNurn:iso:std:iso:80000:-12:ed-2:en:item:12-32.1

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-12/t12-32.1
urn:iso:std:iso:80000:-12:ed-2:en:item:12-32.1

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-12:ed-2:en:item:12-32.1

IEC

urn:iec:std:iec:80000-12:2019:::item:12-32.1

Designations

ENrelaxation time

FRtemps de relaxation

Symbol

τ

Notation systems

Rendered

τ

AsciiMath

tau

LaTeX

\tau

Definition

time constant (ISO 80000-3: Space and time) for scattering, trapping or annihilation of charge carriers, phonons or other quasiparticles

constante de temps (ISO 80000-3: Space and time) pour la diffusion, le piégeage ou l'annihilation des porteurs de charge, des phonons ou d'autres quasi-particules

Units

s

second

View related quantities →

Notes

For electrons in metals,

τ = \frac{l}{ν_{F}}

where $l$ is mean free path (mean free path of electrons) and $ν_{F}$ is speed (ISO 80000-3: Space and time) of electrons on the Fermi surface.

Pour les électrons dans les métaux :

τ = \frac{l}{ν_{F}}

où $l$ est le libre parcours moyen (mean free path of electrons) et $ν_{F}$ est la vitesse (ISO 80000-3: Space and time) des électrons sur la sphère de Fermi.

Concept HierarchyPendrill (2024)

Ttime-type quantitiesLevel 0 · Kind

Broader concepts

◇ time-type quantities

Ontology
isq:Quantity smart:TermEntry

Class Hierarchy

smart:Entity smart:TermEntryisq:Quantity

A physical quantity as defined in ISO/IEC 80000, with associated symbols, definitions, and units of measurement.

Instance IRI

isq:t12-32.1

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	12-32.1
skosxl:prefLabel	"relaxation time <condensed matter>"@en
skosxl:altLabel	"tau"@en
skos:definition	time constant (<<iso80000-3>>) for scattering, trapping or annihilation of charge carriers, phonons or other quasipartic…
skos:note	For electrons in metals, [stem%unnumbered] ++++ tau = l/nu_"F" ++++ where stem:[l] is mean free path (<<t12-15.2>>) an…
isq:hasUnit	s (second)
isq:hasDimension	isq:Dimension
smart:hasBindingnessType	bindingness-type:normative
dcterms:isPartOf	isq:part-12

Related Entities

isq:QuantityShape isq:part-12 isq:Unit isq:Dimension isq:hasDimension smart:TermEntry