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在样品池条件下,利用原子荧光光谱方法,测量了Rb(5D)-He,Ar,H_2碰撞中5D→7S的激发能量转移截面。获得的荧光包括由激发态产生的直接荧光部分和由于碰撞布居态而产生的敏化荧光部分。在不同的猝灭气体压强下,测量丁相关的两部分荧光的相对荧光强度,得到了Rb(5D)与He,Ar和H_2碰撞的5D→7S转移截面分别为(1.2±0.3)×10~(-17)cm~2,(1.3±0.3)×10~(-18)cm~2和(8.3±2.1)×10~(-17)cm~2。同时确定了Rb(7S)与He,Ar和H_2的碰撞猝灭速率系数。7S态与H_2的碰撞猝灭速率系数1.7×10~(-10)cm~3·s~(-1)比Rb(7S)与He,Ar的大得多,它是反应与非反应速率系数之和,利用实验数据确定Rb(75)与H_2的反应截面为(1.0±0.4)×10~(-16)cm~2,Rb(5D)与H_2反应截面为(7.1±2.9)×10~(-17)cm~。Rb(7S)与H_2的反应活动性大于Rb(5D)。
Under the condition of sample cell, the excitation energy transfer cross section of 5D → 7S in the Rb (5D) -He, Ar, H 2 collisions was measured by atomic fluorescence spectrometry. Fluorescence obtained includes both the direct fluorescence moiety resulting from the excited state and the sensitized fluorescence moiety resulting from the collisional population. Under different quenching gas pressures, the relative fluorescence intensities of the two related fluorescences were measured. The 5D → 7S transfer cross sections for the collision between Rb (5D) and He, Ar and H_2 were (1.2 ± 0.3) × 10 ~ (-17) cm ~ 2, (1.3 ± 0.3) × 10 ~ (-18) cm ~ 2 and (8.3 ± 2.1) × 10 ~ (-17) cm ~ At the same time, the coefficient of collision quenching rate between Rb (7S) and He, Ar and H 2 was determined. The quenching rate coefficient of collision between 7S state and H 2 is much larger than that of He and Ar in the range of 1.7 × 10 -10 cm -3 s -1 compared with that of Rb (7S). It is the coefficient of reaction and nonreaction rate The reaction cross section between Rb (75) and H_2 was (1.0 ± 0.4) × 10 ~ (-16) cm ~ 2 and the cross section between Rb (5D) and H_2 was (7.1 ± 2.9) × 10 ~ (-17) cm ~. The reactivity of Rb (7S) with H 2 is greater than that of Rb (5D).