atomic spectrum

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Noun

1.atomic spectrum - (physics) a spectrum of radiation caused by electron transitions within an atom; the series of spectrum lines is characteristic of the elementnatural philosophy, physics - the science of matter and energy and their interactions; "his favorite subject was physics"spectrum - an ordered array of the components of an emission or wavefine structure - the presence of groups of closely spaced spectrum lines observed in the atomic spectrum of certain elements; "the fine structure results from slightly different energy levels"