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K(5P)与H_2的反应碰撞和电子-振动能量转移

Reaction andelectronic-vibrational energy transfer between K(5P)and H_2
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摘要 K(5P)与H2反应生成KH(v″=0-3)振动态,测量了各振动态的转动分布,转动玻尔兹曼温度为455K,而振动温度为1604K,这个接近池温的转动温度和很高的振动温度是共线碰撞机制的有力证据.利用高分辨率瞬时吸收技术得到各振动能级上转动态的布居分布,从而得到反应碰撞转移速率系数,对于v″=0、1、2、3,分别为(3.45±0.86)×10-13、(1.35±0.34)×10-13、(6.28±1.57)×10-14和(2.35±0.59)×10-14cm3s-1.同时研究了K(5P)-H2的电子-振动能量转移,利用相干反斯托克斯拉曼散射(CARS)探测H2的振动态分布.扫描CARS谱发现v=1、2、3上有布居.由CARS峰值得到H2(0,1)、(1,1)、(2,1)、(3,1)和(3,3)布居之比.H2(0,1)布居由450K的转动分布得到,因而得到(1,1)、(2,1)、(3,1)和(3,3)态的布居,从而获得K(5P)-H2(1,1)、(2,1)、(3,1)和(3,3)的电子-振转速率系数分别是(1.1±0.3)×10-13、(9.3±2.5)×10-14、(4.2±1.1)×10-14和(3.8±1.0)×10-14cm3s-1. The rotational distribution of KH（v″=0-3）produced in the reaction of K（5P）with H2 has been studied.The resulting rotational states fit roughly a statistical distribution at the system tempera-ture,while the vibrational populations are characterized by a Boltzmann vibrational temperature of 1604K.These results provide evidence that the reaction follows a collinear collisional geometry.Using transient absorption techniques distributions of nascent KH rotational populations in the ground （v″=0） state and vibrationally excited （v″=1,2,3）are determined.The rate coefficients of reaction are （3.45 ±0.86）×10-13,（1.35±0.34）×10-13,（6.28±1.57）×10-14and （2.35±0.59）×10-14cm3s-1 for v″=0, 1,2 and 3,respectively.The electronic-to-vibrational energy transfer between K（5P）and H2 has also been investigated.We have used the CARS （Coherent Anti-stokes Raman Scattering）spectral technique to probe the internal state distribution of collisionally-populated H2 molecules.The scanned CARS spec-tra reveal that during E-V energy transfer processes H2 molecules are produced at the v=1 ,2 and 3 vi-brational levels.From the scanned CARS spectral peaks the H2（0,1）,（1,1）,（2,1）,（3,1）and （3, 3）population ratios are obtained.The population in H2 （0,1）is determined from rotational distribution at 450K for v=1. The populations of （1,1）,（2,1）,（3,1）and （3,3）are obtained.The rate coeffi-cients for K（5P）-H2（1,1）,（2,1）,（3,1）and （3,3）are （1.1±0.3）×10-13,（9.3±2.5）×10-14,（4.2 ±1.1）×10-14 and （3.8±1.0）×10-14 cm3 s-1 ,respectively.
作者 李佳灵 张文军 封丽 刘静 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 2014年第4期589-594,共6页 Journal of Atomic and Molecular Physics
基金 国家科学自然基金(11164028)
关键词 反应机制 电子-振动能量转移 高分辨率瞬时吸收 玻尔兹曼分布 K(5P)+H2 Reaction mechanism Electronic-vibrational energy transfer High-resolution transient ab-sorption Boltzmann distribution K（5P）-H2
分类号 O561.5 [理学—原子与分子物理]
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参考文献17

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原子与分子物理学报
2014年 第4期

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