Rb-Rb光学碰撞精细结构分支比的实验研究

Experimental Fine-structure Branching Ratios for Rb-Rb Optical Collision

研究了在R b52P多重态与R b原子基态的光学碰撞中的精细结构分支比,激光频率调至R b共振跃迁的红翼,定义分支比为I(D1)/I(D2),I(D1)、I(D2)分别为R b的D1和D2线的荧光强度,测量了激光频率从R b5P3/2红翼15cm-1调至50cm-1的分支比,在5P3/2的近红翼,分支比与失谐量有很大的关系.同时测量了R b5PJ态的精细结构转移截面,截面值2σ1为3.2×1-0 15cm2.

Experimental ratios for branching into the fine-structure levels of the Rb 5P multiplet, as a consequence of an optical collision with ground state Rb atoms are reported. The laser frequency v is tuned in the red wing of the Rb resonance transition. The branching ratios are defined as I（D1）/I（D2）, where I（D1） and I（D2） are measured intensities of the atomic Rb D1 and D2 lines. The ratios are determined for detunings ranging from about 15 to 50cm^-1 in the red wing of the Rb state. The branching is found to be strongly detuning dependent in the vicinity of the Rb 5P3/2 near-red-wing. Fine-structure changing cross section has also been measured for Rb 5^2P1 state. The cross section σ21 is 3.2×10^-15cm^2.