描述: 能级是原子或分子内离散的允许存在的量子能态。它的单位是电子伏特（eV）。当原子或分子中的电子从能量较高的能级移动到能量较低的能级时，就会发射出能量等于两个能级之差的光子。同样，如果一个光子的能量等于当前能级和较高能级之差，那它也可能被原子或分子吸收。

相关词条

• 原子
• 分子
• 光子
• 电子

词条和定义状态： 该术语的英文原始定义已通过天文研究人员和教师的审核
该术语及其定义的译文仍待审核

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