J4 ›› 2009, Vol. 26 ›› Issue (3): 262-267.

• 光谱 • 上一篇    下一篇

  Rb(52DJ,7S)+Rb(5S)间的碰撞能量转移

邓玉华,吕磊,许瑾,戴康,沈异凡
  

  1. 新疆大学物理科学与技术学院,    新疆    乌鲁木齐  830046
  • 收稿日期:2008-06-13 修回日期:2008-07-29 出版日期:2009-05-28 发布日期:2009-05-07
  • 通讯作者: 沈异凡(1944-),教授,博导,从事原子分子和光物理研究。 E-mail:shenyifan01@xju.edu.cn
  • 作者简介:邓玉华 (1967-),女,06级研究生,从事原子分子物理方向的研究。
  • 基金资助:

    国家自然科学基金资助项目(10664003)

Energy transfer in Rb(52DJ,7S)+Rb(5S) collisions

 DENG Yu-Hua, LV Lei, XU Jin, DAI Kang, SHEN Yi-Fan   

  1. College of Physics Science and Technology, Xinjiang University, Urumqi 830046, China
  • Received:2008-06-13 Revised:2008-07-29 Published:2009-05-28 Online:2009-05-07

摘要:

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)×10-14cm2。而测得的碰撞转移到Rb(5DJ)以外态的截面是Rb(5DJ)→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(5DJ)→Rb(7S)的碰撞转移截面为(1.6±0.4)×10-16cm2 ,故Rb(5DJ)+Rb(5S)→Rb(5P)+Rb(5P)的截面分别为(3.1±1.2) ×10-14cm2(对J=5/2)和(2.0±0.6) ×10-14cm2(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。

关键词: 光谱, 碰撞能量转移, 荧光, 截面, Rb

Abstract:

Rb vapor was irradiated in a glass fluorescence cell with pulses of radiation from a YAG –laser-pumped OPO laser ,populating 5DJ (or 7S ) state by two-photon absorption .Energy transfer in Rb(5DJ,7S)+ Rb(5S) collision is studied using methods of atomic fluorescence .The resulting fluorescence included a direct component emitted in the optically excited decay and a sensitized component arsing from the collisional populated state. At the different densities of the components , fit a three-state rate equation model to obtain the cross section for Rb(5D5/2)→Rb(5D3/2)transfer: =(3.7±0.9)×10-14cm2 .The cross section for excitation transfer out of the 5DJ doublet are (3.1±1.2) ×10-14cm2.(for J=5/2)and (2.0±0.6) ×10-14cm2.(for J=3/2),respectively .The energy transfer cross section for the Rb(5D)→Rb(7S) is small〔(1.6±0.4)×10-16cm2〕.The 5DJ state is quenched mainly in the reverse energy pooling processes〔i.e. Rb(5DJ)+Rb(5S)→Rb(5P)+Rb(5P)〕.

Key words: spectroscopy, collisoinal energy transfer, fluorescence, cross section, rubidium

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