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    "en": "angular momentum operators"
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  "scope_note": "§14.2 includes total, spin and orbital angular momentum.",
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        "quote": "Any set of three operators $L _ { 1 } , L _ { 2 } , L _ { 3 }$ satisfying the commutation relations <a href=\"#equation-14-25\" class=\"cross-reference\" id=\"xref-02-quantum-dynamics-23\" data-reference=\"equation-14-25\">Eq. (14.25)</a> are said to be <u class=\"concept-term\" data-concept-identity=\"urn:uuid:60d67777-0124-483d-b32a-0fed2ee2d46b\" data-concept-route=\"/concept-identities#concept-60d67777-0124-483d-b32a-0fed2ee2d46b\" id=\"first-08dfb4422b908977d4cd-en\">angular momentum operators</u>. If they are of the form $L _ { i } = \\epsilon _ { i j k } Q _ { j } P _ { k }$ then we term them <u class=\"concept-term\" data-concept-identity=\"urn:uuid:d24133d7-c651-4a09-95d9-bcd4dfecc852\" data-concept-route=\"/concept-identities#concept-d24133d7-c651-4a09-95d9-bcd4dfecc852\" id=\"first-c302a6cf2fa6e33ec1df-en\">orbital angular momentum</u>, else they are called <u class=\"concept-term\" data-concept-identity=\"urn:uuid:14f530a7-cae3-4199-a129-754aeece7b1f\" data-concept-route=\"/concept-identities#concept-14f530a7-cae3-4199-a129-754aeece7b1f\" id=\"first-7d8bfa0700d40e3eaff6-en\">spin angular momentum</u>, or a combination thereof. If we set $J _ { i } = L _ { 1 } / \\hbar$ and $J ^ { 2 } = ( J _ { 1 } ) ^ { 2 } + ( J _ { 2 } ) ^ { 2 } + ( J _ { 3 } ) ^ { 2 }$ then",
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