fine structure

Noun
  1. The presence of groups of closely spaced spectrum lines observed in the atomic spectrum of certain elements (synset 111478003)
    "the fine structure results from slightly different energy levels"
    is a type of: spectrum line - an isolated component of a spectrum formed by radiation at a uniform frequency
    is a part of: atomic spectrum - (physics) a spectrum of radiation caused by electron transitions within an atom; the series of spectrum lines is characteristic of the element

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