Glossary term: 能級
Description: 能級是原子或分子內離散的允許存在的量子能態。它的單位是電子伏特（eV）。當原子或分子中的電子從能量較高的能級移動到能量較低的能級時，就會發射出能量等於兩個能級之差的光子。同樣，如果一個光子的能量等於當前能級和較高能級之差，那它也可能被原子或分子吸收。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
This is an automated transliteration of the simplified Chinese translation of this term
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