@prefix isq: <https://w3id.org/standards/isq/ontologies/core/> .
@prefix smart: <https://example.org/smart-sdu/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<isq:t12-9.1>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "12-9.1" ;
  skosxl:prefLabel "angular wavenumber"@en ;
  skosxl:altLabel "angular repetency <condensed matter physics>"@en ;
  skosxl:altLabel "k"@en ;
  skosxl:altLabel "(q)"@en ;
  skos:definition "quotient of momentum (<<iso80000-4>>) and the reduced Planck constant (<<iso80000-1>>)"@en ;
  smart:hasBindingnessType "bindingness-type:normative" ;
  dcterms:isPartOf <isq:part-12> ;
  isq:hasUnit [
    skos:notation "m^(-1)" ;
    skosxl:prefLabel "per metre"@en
  ] ;
  skos:note "The corresponding vector (<<iso80000-2>>) quantity is called wave vector (<<iso80000-3>>), expressed by:\n\n[stem%unnumbered]\n++++\nbb(ii(k)) = bb(ii(p))/\"P{hbar}\"\n++++\n\nwhere stem:[bb(ii(p))] is the momentum (<<iso80000-4>>) of quasi free electrons in an electron gas, and stem:[\"P{hbar}\"] is the reduced Planck constant (<<iso80000-1>>); for phonons, its magnitude is\n\n[stem%unnumbered]\n++++\nk = (2pi)/lambda\n++++\n\nwhere stem:[lambda] is the wavelength (<<iso80000-3>>) of the lattice vibrations.\n\nWhen a distinction is needed between stem:[k] and the symbol for the Boltzmann constant (<<iso80000-1>>), stem:[k_\"B\"] can be used for the latter.\n\nWhen a distinction is needed, stem:[q] should be used for phonons, and stem:[k] for particles such as electrons and neutrons.\n\nThe method of cut-off must be specified.\n\nIn condensed matter physics, angular wavenumber is often called wavenumber.\n"@en ;
  iso:urn <urn:iso:std:iso:80000:-12:ed-2:en:item:12-9.1> .