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高振动激发LiCs与CO2碰撞中的振动-转动能量转移
Vibrational to rotational energy transfer in highly vibrationally excited LiCs-CO2 collisions
摘要点击 94  全文点击 45  投稿时间:2017-02-17  修订日期:2017-03-08
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DOI编号  
中文关键词   碰撞能量转移  瞬时荧光测量  原生转动态分布  出现和倒空速率系数  高振动激发LiCs  CO2
英文关键词   Collisional energy transfer  Transient fluorescence measurement  Nascent rotational distribution  Appearance and depletion rate constants  Highly vibrationally excited LiCs  CO2
基金项目   国家自然科学基金,新疆大学自然科学基金项目
作者单位E-mail
王淑英 新疆大学 wsysmilerr@sina.com 
范雯萱 新疆大学物理科学与技术学院  
高永明 新疆大学物理科学与技术学院  
白雪 新疆大学物理科学与技术学院  
戴康 新疆大学物理科学与技术学院  
沈异凡 新疆大学物理科学与技术学院  
中文摘要
    受激发射泵浦得到的LiCs高位振动态与CO2碰撞,研究了LiCs不同能量对碰撞能量转移过程的影响。利用高分辨率瞬时激光感应荧光(LIF )测量得到CO2(0000, J=2-74)原生转动态分布。转动布居数的半对数描绘给出了一个双指数结构,得到了一个Ta=660±73K[对LiCs(E=4300cm-1)]和550±61K[对LiCs(E=3700cm-1)]的低能分布,一个Tb=2380±261K[对LiCs(E=4300cm-1)]和1980±217K[对LiCs(E=3700cm-1)]的高能分布,低能分布属于弹性或弱非弹性碰撞,高能分布属于强非弹性碰撞。转动分布对LiCs能量是敏感的。但弹性与非弹性分支比基本是相同的。在一次碰撞的条件下,测量了各J态的出现和倒空速率系数,它们仅弱依赖于LiCs激发能。出现和倒空速率系数对不同LiCs能量基本一致,是振动-转动/平移弛豫轨道的重要证据。
英文摘要
    Highly vibrationally excited LiCs was achieved by stimulated emission pumping. The full state-resolved distribution of scatted CO2(0000) molecules from collisions with excited LiCs is reported. How internal energy content impacts the dynamics for collisional quenching of high energy molecules are investigated. Nascent rotational state distributions for scatted CO2(0000) molecules with J=2-74 were measured using high resolution transient laser induced fluorescence (LIF). The semilog plot shows evidence of a biexponential distribution. The fitting yields a low energy distribution Ta and a high energy distribution Tb. For E=4300cm-1, we find that Ta=660±73K and Tb=2380±261K, compared to Ta=550±61K and Tb=1980±217K for E=3700cm-1. The spread of the rotational distribution is sensitive donor energy, but the branching ratio for elastic and inelastic collisions is the same for both donor energies. The overall appearance and depletion rates constants were measured. The measured collision rate constants are only weakly dependent on changes in LiCs energy. The agreement of the overall appearance and depletion rates at two different LiCs energies provides evidence for the importance of vibration-rotation/translation relaxation channel.

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