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Cs(6D_(5/2))+H_2→CsH[X^1∑^+(v,J)]+H转动分辨总截面的测量 被引量：1

Measurement of the rotationally resolved total cross sections for the Cs(6D_(5/2))+H)2→CsH[X^1Σ^+(v,J)]+H reaction
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摘要 利用泵浦-检测方法,在样品池条件下,研究了Cs(6D_(5/2))与H_2反应碰撞传能过程.利用激光感应荧光(LIF)光谱技术,确定了CsH[X^1∑^+(v,J)]振转能级上的布居分布,转动态分布与热统计分布基本一致.Cs激发态原子密度由激光能量吸收得到.记录A^1∑^+(υ’,J+1)→X^1∑^+(υ,J)的时间分辨荧光,从荧光强度的对数值给出的直线斜率确定(υ’,J+1)→(υ,J)的自然辐射率,结合(υ,J)→(υ’,J+1)吸收系数的测量,得到反应生成物CsH[X^1∑^+(υ,J)]态的分子密度.由速率方程分析,给出反应截面σ(υ,J),对J求和,得到σ(υ)[10^(-16)cm^2单位]分别为(0.64±0.19)(υ=0)和(0.58±0.17)(υ=1). Using a pump-probe method, the reaction of Cs（6D5/2） with H2 in a crossed heat pipe oven has been studied. The nascent rotational distributions of Cs[X1∑＋ （v= 0, 1; J） ] were determined from laser induced fluorescence （LIF） spectra. The rotational population profile was roughly consistent with a sta- tistical distribution at the system temperature. The decay signal of time resolved fluorescence from A^1＋∑ （v＇ ,J＋1）→X^1∑^＋ （v,J） transition was monitored. The semilog plot of the time resolved fluorescence was shown. The slope yielded the transition probability. The densities of the Cs（6D5/2） atoms excited by the pulse laser beam were evaluated directly from the laser energy loss which was absorbed by Cs atoms. The densities of CsH[X^1∑＋ （v,J）] molecules were measured the absorption of the probe laser beam, reduced to 10 nJ using neutral density filters. Using a rote equation model, reactive cross sections a （v,J） have been obtained. The cross sections a （v） are yielded by summing the individual cross sectionsa （v,J）. The cross sections（in units of 10^-16cm^2） are （0.64±0.19） for v being 0 and （0.58±0.17） for v being 1, respectively.
作者 栾楠楠 张利平 蔡勤 戴康 沈异凡
机构地区 新疆大学物理科学与技术学院
出处 《原子与分子物理学报》 CAS CSCD 北大核心 2011年第2期267-270,共4页 Journal of Atomic and Molecular Physics
基金 国家自然科学基金(10964011)
关键词 激光化学 泵浦-检测方法 布居分布 截面 Cs—H2 laser chmistry, pump-probe method, population distribution, cross section, Cs-H2
分类号 O561.5 [理学—原子与分子物理] O644.18 [理学—物理化学]
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参考文献10

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共引文献2

同被引文献16

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原子与分子物理学报
2011年 第2期

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