Glossary term: 能级
Description: 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。
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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
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
