自发跃迁 meaning in English

spontaneous transition

For the sake of the practical application , the 1s to 2p transitional spectra of the group composed by na10 + and al12 + or another group composed by mg11 + and si13 + will be selected to use in the calculation about relation of relative intensity of spectra and electronic temperatures for making theoretical values approaching practice
计算所得的能级跃迁波长、自发跃迁几率a 、受激跃迁几率gb和振子强度是对实验所用光谱数据的补充。此外研究表明，利用z = 2的不同元素作示踪元素进行温度诊断是合理可行的。