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日本物理学会講演概要集

27aA-10 Rb_ Cs_xCl(x=0.18)混晶のオージェフリー発光帯における光増幅

修治 浅香, 稔 伊藤, 吉穂 朴本, 順一 村上, 雅夫 鎌田

Published Sep 3, 1999• 0 citations
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The cross section σ = (8 ± 4) × 10 −15 cm 2 was determined for the Rb(7S) + Rb(5S) → Rb(5D) + Rb(5S) excitation energy transfer process, and the quenching cross section σ q = (2 ± 1) × 10 −14 cm 2 for the Rb(5D) state in collisions with ground state Rb atoms. Applying rubidium quasimolecular asymptotic potential curves at relatively large internuclear distances, a qualitative interpretation of the experimental results is presented. It is shown that the quenching of the Rb(5D) atoms in collisions may be explained by a reversed energy pooling process Rb(5D) + Rb(5S) → Rb(5P) + Rb(5P).
利用脉冲激光双光子激发Rb(5S)到Rb(5DJ,7S)态,在样品池条件下,利用原子荧光光谱方法研究了Rb(5DJ,7S)+Rb(5S)的碰撞能量转移过程。利用三能级模型的速率方程分析,在不同的Rb(5S)密度下,通过对直接荧光和转移荧光的时间积分荧光强度的测量,得到了Rb(5D5/2)→Rb(5D3/2)精细结构转移截面为(3.7±0.9)×10^-14cm^2。而测得的碰撞转移到Rb(5DJ)以外态的截面是Rb(5D)-→Rb(7S)转移截面和碰撞能量合并逆过程截面之和,还可测得Rb(5D)→Rb(TS)的碰撞转移截面为(1.6±0.4)×10^-16cm^2,故Rb(5D)+Rb(5S)→Rb(5P)+Rb(5P)的截面分别为(3.1±1.2)×10^-14cm^2(对J=5/2)和(2.0±0.6)×10^-14cm^2(对J=3/2),5DJ态主要是通过碰撞能量合并的逆过程(即Rb(5DJ)+Rb(5S)→Rb(5P)+Rb(5P))猝灭。