| NOUN | phenomenon | fine structure | the presence of groups of closely spaced spectrum lines observed in the atomic spectrum of certain elements |
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| Meaning | The presence of groups of closely spaced spectrum lines observed in the atomic spectrum of certain elements. | |
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| Example | "the fine structure results from slightly different energy levels" | |
| Part of | atomic spectrum | (physics) a spectrum of radiation caused by electron transitions within an atom |
| Broader | spectrum line | An isolated component of a spectrum formed by radiation at a uniform frequency |
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