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Cs(6P)激发态的辐射及与He碰撞的能量转移

Radiation and Collision Energy Transfer of Excitated Cs(6P) Atoms Mixed with He

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摘要

利用激光吸收和荧光方法,测量了Cs(6P)态与He碰撞的精细结构转移和碰撞猝灭截面。Cs原子被激光激发到6P3/2态,将与抽运激光束反向平行的检测激光束调到6PJ→8S1/2的跃迁,测量6PJ激发态的密度及空间分布,由此计算了6PJ→6S的有效辐射率。T=337 K,He密度N在0.5×1018~4×1018 cm-3范围内测量了6P1/2→6S1/2(895 nm)发射的敏化荧光强度I895。N/I895与N有抛物线型的关系,表明6PJ的猝灭是由于与He原子的碰撞产生的,而不是由与Cs基态原子碰撞产生的。由最小二乘法确定的二次多项式的系数得到6P态与He碰撞精细结构转移截面σ3/2→1/2=(1.46±0.51)×10-19 cm2,猝灭截面σD=(2.28±0.80)×10-18 cm2。

Abstract

By applying the laser absorption and fluorescence method, the cross sections for the fine structure mixing and quenching of the Cs(6P) state, induced by collision with He atoms, have been measured. Cesium atoms were optically excited to the 6P3/2 state. The excited atom density and spatial distribution were mapped by monitoring the absorption of a counterpropagating single mode laser beam, which was tuned to the 6PJ→8S1/2 transitions. The effective radiative rates were calculated for the 6PJ→6S transitions. The fluorescence intensity I895 of the sensitized 6P1/2→6S1/2 emission was measured as a function of He density in the range 0.5×1018~4×1018cm-3 at constant temperature T=337 K. It was found that the quantity N/I895 exhibited a parabolic dependence on N, confirming that the quenching of the 6PJ states was due to collision with He atoms, not ground state Cs atoms. The coefficients of the second-order polynomial fitted through the measured data yielded the cross sections σ3/2→1/2=(1.46±0.51)×10-19 cm2 and σD=(2.28±0.80)×10-18 cm2 for the 6PJ fine structure mixing and quenching, respectively, due to collision with He atoms.

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中图分类号:O 562.5;O 657.38

所属栏目:激光物理

基金项目:国家自然科学基金(10264004)资助项目。

收稿日期:2007-01-09

修改稿日期:2007-03-29

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许瑾:新疆大学物理科学与技术学院, 新疆 乌鲁木齐 830046
王青: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:许瑾(xjcxz2008@163.com)

备注:许瑾(1970—),女,江苏人,讲师,硕士研究生,主要从事激光光谱学研究。

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引用该论文

许瑾,王青,戴康,沈异凡. Radiation and Collision Energy Transfer of Excitated Cs(6P) Atoms Mixed with He[J]. Chinese Journal of Lasers, 2007, 34(9): 1237-1240

许瑾,王青,戴康,沈异凡. Cs(6P)激发态的辐射及与He碰撞的能量转移[J]. 中国激光, 2007, 34(9): 1237-1240

被引情况

【1】陈洁,白振岙,赵亿坤,戴康,沈异凡. Rb+(Ar,N2)混合蒸气中5P3/2能级有效辐射率的计算和测量. 中国激光, 2008, 35(6): 907-910

【2】张岩文,万鸿飞,崔秀花,戴康,吕磊,王睿,沈异凡. Rb(5D-7S)-He, Ar, H2的碰撞能量转移. 中国激光, 2009, 36(8): 2009-2013

【3】蔡勤,张利平,栾楠楠,程玉锋,戴康,沈异凡. 在Na2(A1+u)与H2碰撞中的相干反斯托克斯拉曼谱研究. 中国激光, 2011, 38(7): 715001--1

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