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Enhancement of Rb fine-structure transfer in ~(4)He due to three-body collisions

机译:三体碰撞增强了〜(4)He中Rb精细结构的转移

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摘要

Using ultrafast laser excitation and time-correlated single-photon counting techniques, we have measured the collisional mixing rates between the rubidium 5~(2)P fine-structure levels in the presence of ~(4)He gas. A nonlinear dependence of the mixing rate with ~(4)He density is observed. We find Rb fine-structure transfer is primarily due to binary collisions at ~(4)He densities of <=10~(19) cm~(-3), while at greater densities, three-body collisions become significant. We determine a three-body collisional transfer rate coefficient (5~(2)P_(3/2) -> 5~(2)P_(1/2)) of 1.25(9) X 10~(-32) cm~(6)/s at 22 deg C.
机译:使用超快激光激发和时间相关的单光子计数技术,我们测量了在〜(4)He气存在下5 5〜(2)P精细结构能级之间的碰撞混合速率。观察到混合速率与〜(4)He密度呈非线性关系。我们发现Rb的精细结构转移主要是由于在〜(4)He密度<= 10〜(19)cm〜(-3)处的二元碰撞,而在更大的密度下,三体碰撞变得显着。我们确定三体碰撞传递速率系数(5〜(2)P_(3/2)-> 5〜(2)P_(1/2))为1.25(9)X 10〜(-32)cm〜 22摄氏度时为(6)/ s

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