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Cs(6DJ)+Cs(6S1/2)非弹性碰撞转移截面的测定

Experimental Evaluation of the Cross Sections in Cs(6DJ)+Cs(6S1/2) Inelastic Collisions

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摘要

在9×1014~2.1×1015 cm-3 Cs密度范围内, 利用脉冲激光双光子激发Cs(6S1/2)到Cs(6D5/2)态, 使用原子荧光光谱方法, 通过三能级模型的速率方程分析, 由对直接荧光和转移荧光的时间积分强度的测量, 得到6D5/2→6D3/2精细结构转移截面为(2.1±0.4)×10-14 cm2, 而6D3/2态向6D以外态的转移截面为(1.6±0.4)×10-14 cm2, 它应是过程Cs(6D3/2)+Cs(6S)→Cs(6P)+Cs(6P), 6D3/2→7P3/2和6D3/2→7P1/2碰撞转移截面之和。 第二个实验可以得到6D3/2→7P3/2和6D3/2→7P1/2的碰撞转移截面。 在1×1012~6×1012 cm-3的低密度Cs蒸气中, 激光双光子激发6S至6D3/2或6D5/2态, 测量6DJ→6PJ′与7PJ″→6S1/2的时间积分荧光强度比, 得到6D3/2→7P1/2与6D5/2→7P3/2的碰撞转移截面分别为(7.6±2.4)×10-16 cm2与(1.6±0.5)×10-15 cm2。 由此得到碰撞能量合并的逆过程即[Cs(6D3/2)+Cs(6S1/2)→Cs(6P)+Cs(6P)]的转移截面为(1.3±0.4)×10-14 cm2。

Abstract

At a Cs density higher than 9×1014 cm-3, cesium vapor was irradiated in a glass fluorescence cell with pulses of radiation from an YAG-laser-pumped OPO laser, populating 6D5/2 state by two-photon absorption. Energy transfer in Cs6(D5/2)+Cs(6S) collisions was studied using methods of atomic fluorescence. At the different Cs densities, we have measured the time-integrated intensities of the components and fitted a three-state rate equation model to obtain the cross sections. The experimental points were fitted to a straight line very well. The authors converted the gradient and intercept into cross sections. The cross section for 6D5/2→6D3/2 transfer is (2.1±0.4)×10-14 cm2. The cross section for excitation transfer out of the 6D doublet is σQ=(1.6±0.4)×10-14 cm2. The cross section σQ contains information on reverse energy pooling collisions [i.e., Cs(6D3/2)+Cs(6S1/2)→Cs(6P)+6Cs(P)] and contribution from mining in 6DJ→7PJ′, This latter contribution could be subtracted out using the results of a second experiment. At a Cs density lower than 6.0×1012 cm-3, the laser was used to pump the 6D3/2 and 6D5/2 states, respectively. The resulting fluorescence included the direct component emitted in the decay of the 6DJ state and the sensitized component arising from the collisionally populated 7PJ′state. Relative intensities of the components yielded the cross sections. The cross-sections for the processes Cs(6D5/2)+Cs(6S1/2)→Cs(7PJ′)+Cs(6S1/2) are (1.6±0.5)×10-15 cm2. for J′=3/2 and (6.5±2.1)×10-16 cm2, for J′=1/2, respectively. The cross-sections for the processes Cs(6D3/2)+Cs(6S1/2) →Cs(7PJ′)+Cs(6S1/2) are (1.9±0.6)×10-15 cm2. for J′=3/2 and (7.6±2.4)×10-16 cm2, for J′=1/2, respectively. The 6DJ→7PJ′, energy transfer rate coefficient is small. The total quenching rate coefficient out of the 6DJ state is much larger. Evidence suggests that the quenching of the 6DJ state is caused predominantly by reverse energy-pooling process. The cross section for this process, i.e., Cs(6D3/2)+Cs(6S1/2)→Cs(6P)+Cs(6P) is (1.3±0.4)×10-14 cm2.

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中图分类号:O562.3;O562.4

基金项目:国家自然科学基金项目(10664003)资助

收稿日期:2008-06-02

修改稿日期:2008-09-06

网络出版日期:0001-01-01

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郭启存:新疆大学物理科学与技术学院, 新疆 乌鲁木齐830046
吴红萍:新疆大学物理科学与技术学院, 新疆 乌鲁木齐830046
康丽奎:西北农林科技大学机械与电子工程学院, 陕西 杨凌712100
万鸿飞:新疆大学物理科学与技术学院, 新疆 乌鲁木齐830046
戴康:新疆大学物理科学与技术学院, 新疆 乌鲁木齐830046
沈异凡:新疆大学物理科学与技术学院, 新疆 乌鲁木齐830046

联系人作者:郭启存(shenyifan01@xju.edu.cn)

备注:郭启存, 1983年生, 新疆大学物理科学与技术学院研究生

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引用该论文

GUO Qi-cun,WU Hong-ping,KANG Li-kui,WAN Hong-fei,DAI Kang,SHEN Yi-fan. Experimental Evaluation of the Cross Sections in Cs(6DJ)+Cs(6S1/2) Inelastic Collisions[J]. Spectroscopy and Spectral Analysis, 2009, 29(9): 2309-2312

郭启存,吴红萍,康丽奎,万鸿飞,戴康,沈异凡. Cs(6DJ)+Cs(6S1/2)非弹性碰撞转移截面的测定[J]. 光谱学与光谱分析, 2009, 29(9): 2309-2312

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