亞穩態物理學化學中指原子原子核或其他動力系統所具有的比一般激發態持續時間更久的特殊激發態,而亞穩態通常又比基態持續時間短。不同亞穩態的原子核形成了核同質異能素。亞穩態原子通常在和其他原子發生碰撞後失去能量。亞穩態原子核常以伽馬放射的形式失去能量,

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