"isotope shift" meaning in English

{
  "forms": [
    {
      "form": "isotope shifts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "isotope shift (plural isotope shifts)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Energy",
          "orig": "en:Energy",
          "parents": [
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Nuclear physics",
          "orig": "en:Nuclear physics",
          "parents": [
            "Physics",
            "Quantum mechanics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "a small difference in the transition energies of isotopes that corresponds to a given spectral line transition"
      ],
      "id": "en-isotope_shift-en-noun-j0bzNqu9",
      "links": [
        [
          "nuclear physics",
          "nuclear physics"
        ],
        [
          "difference",
          "difference"
        ],
        [
          "transition energies",
          "transition energy"
        ],
        [
          "isotope",
          "isotope"
        ],
        [
          "spectral line",
          "spectral line"
        ],
        [
          "transition",
          "transition"
        ]
      ],
      "qualifier": "nuclear physics",
      "raw_glosses": [
        "(nuclear physics) a small difference in the transition energies of isotopes that corresponds to a given spectral line transition"
      ]
    }
  ],
  "word": "isotope shift"
}

{
  "forms": [
    {
      "form": "isotope shifts",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "isotope shift (plural isotope shifts)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Energy",
        "en:Nuclear physics"
      ],
      "glosses": [
        "a small difference in the transition energies of isotopes that corresponds to a given spectral line transition"
      ],
      "links": [
        [
          "nuclear physics",
          "nuclear physics"
        ],
        [
          "difference",
          "difference"
        ],
        [
          "transition energies",
          "transition energy"
        ],
        [
          "isotope",
          "isotope"
        ],
        [
          "spectral line",
          "spectral line"
        ],
        [
          "transition",
          "transition"
        ]
      ],
      "qualifier": "nuclear physics",
      "raw_glosses": [
        "(nuclear physics) a small difference in the transition energies of isotopes that corresponds to a given spectral line transition"
      ]
    }
  ],
  "word": "isotope shift"
}