An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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fine-structure line
  خط با ساختار ِ نازک  
xatt bâ sâxtâr-e nâzok
Fr.: raie de structure fine  

A → spectral line whose → energy levels have a → fine structure. Examples are [C II] 157.7 μm (→ singly ionized carbon), [O III] 88 μm, and [Ne II] 12.8 μm.

See also: → fine; → structure; → line.