锶原子互组跃迁谱的实验研究

Experimental investigation of spectrum of strontium intercombination transition

观测了热原子束中锶原子(5s^2)~1So—(5_s5_p)~3P_1互组跃迁的荧光谱和饱和荧光谱,实验测定了不同的参量下88~Sr(5s^2)~1S_o—(5_s5_p)~3P_1互组跃迁荧光谱.研究结果表明:不同的实验参数(温度、激光光强、激光扫描频率)对谱线有较大的影响,(5_s5_p)~3P_1态的长寿命特点导致谱线强度随激光扫描频率呈倒数关系变化;由于Doppler增宽,渡越增宽等因素的影响,谱线线宽远大于其自然线宽且随激光扫描频率呈正比关系变化.

We observe the fluorescence and the saturated fluorescence spectra of（5s^2）~1 S_0—（5s5p）~3P_1 intercombination transition of thermal strontium atomic beam.Experimental investigation of ^（88）Sr（5s^2）~1S_0—（5s5p）~3P_1 intercombination transition is performed on the different experimental conditions.Our study indicates that experimental parameters affect spectra largely,including temperature,intensity of laser and scanning frequency of laser.Intensity of spectrum is reciprocal of scanning frequency of laser due to long lifetime of（5s5p）~3P_1 state of Sr atom.Owing to Doppler broadening,transit broadening and other experimental factors,the linewidth of （5s^2）~15_0—（5s5p）~3P_1 fluorescence spectrum is far more than its natural linewidth and proportional scanning frequency of laser.