An atom on an excited upper level can execute a downward transition not just spontaneously but also when photons of the radiation field surrounding the atomic interact with it.

 
  • 處在較高的激發(fā)態(tài)上的原子不只可以自發(fā)地而且可以在它與原子系統周?chē)椛鋱?chǎng)的光子相互作用時(shí)發(fā)生向下的躍遷。
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