受激原子 excited atom 原子低能级的电子，受外界的扰动而跃迁到较高能级，处在这种状态的原子就称为受激原子。这类原子通常会以电磁辐射的方式，释放出激发态的能量。
证实了在低原子浓度下探测受激辐射的可能性，并估计了用受激辐射信号检测杂质的可能性。
The possibility of the stimulated radiation at the low atomic density is demonstrated, and the possibility of impurity examination by means of stimulated radiation signals is estimated.
某些受激的原子会发生辐射性退激。
铯133原子发射一个细的微波谱线当它的第55个电子从受激态轨道跳回基态时(跃迁)。
Cesium-133 atoms emit a thin microwave spectral line when its 55th electron jumps back from an excited state orbital to its ground state (transition).
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