中文摘要：

Ba原子是光频标的候选者之一,对其进行有效的激光冷却与囚禁需要相关能级的寿命和跃迁几率的信息。Ba原子激发态6s6p~3P_1能级在激光冷却实验中很重要,通过Hanle效应实验测量了这一能级的寿命和自发辐射率,从理论和实验上研究了探测激光有限线宽和光强对Ba原子基态6s~2 ~1S_0与激发态6s6p~3P_1之间跃迁（波长791 nm）Hanle效应荧光信号的影响。在考虑了激光线宽和光强因素后所得到的激发态6s6p3P1的能级寿命和自发辐射率与其他方法给出的结果符合很好。

英文摘要：

Barium atom is one of candidates for optical atomic clock. Laser cooling and trapping the atom need sufficient spectroscopic information of relevant energy levels. The excited energy level 6s6p3p1 is very important in the experiment of laser cooling and trapping barium atoms. Hanle effect was examined both theoretically and experimentally for the 6s2 ~ So to 6s6p 3P1 transition at 791 nm. A theoretical model was developed to include the influence of linewidth and intensity of probe laser on the fluorescence of Hanle effect. By fitting the experimental measurement with the model, lifetime and transition probabilities of 6s6p 3P1 state to lower states were obtained and found to be in good agreement with other reports.