而光辐射可能有两种情形，一种情形是原子自发地由高能态跃迁到低能态，这称为自发跃迁（spontaneous transition），相应的辐射称为自发辐射（spontaneous radiation）。
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给出爱因斯坦几率系数的新定义；进而计算了双光子自发跃迁几率，并对结果作了分析讨论。
First, We set up the two-photon Planck radiation equation, then give a new definition of Einsient probability coefficients, calculate the two-photon transition probability and analyze the results.
采用原子蒸气束激光诱导荧光法测量钆原子的第一激发态的同位素位移及超精细结构、原子跃迁自发辐射的分支比和原子蒸气束的多普勒宽度。
The isotope shifts, hyperfine structure, spontaneous emission branch ratio of the first excited level and Doppler width of the atom vapor beam were measured using laser induced fluorescence.
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