高振动激发态LiH(X^1Σ^+,ν=9～15)与H_2,CO_2间振动弛豫的能量相关性  

Energy-dependence of Vibrational Relaxation between Highly Vibrationally Excited LiH(X^1Σ^+,ν = 9 ～ 15) and H_2 and CO_2

作　　者：冯亮[1] 王淑英[1] 张彬[1] 朱冬辉[1] 戴康[1] 沈异凡[1] 王倩[1] 

机构地区：[1]新疆大学物理科学与技术学院,新疆乌鲁木齐830046

出　　处：《新疆大学学报（自然科学版）》2012年第1期82-88,共7页Journal of Xinjiang University(Natural Science Edition)

基　　金：国家自然科学基金项目(10964011)

摘　　要：Li(2p)与H2反应,生成LiH(X1Σ+,v=0)态,利用泵浦-检测实验方案,研究了LiH(v=9～15)与H2,CO2间振动弛豫速率系数kv(M)(M=H2,CO2).对于v″=9-12,kv(M)随v的增加呈线性增加,在这个区域内,单量子碰撞弛豫(v=1)占优势,对于v″=13～15,速率系数随v的增加比线性关系强得多,在这个区域内多量子弛豫(v≥2)或LiH高位振动态与H2,CO2间的共振振动-振动能量转移有很大的贡献.在LiH(v″)+H2碰撞中,对于v″=13,14,15能级,由双量子振动弛豫(v=2)产生的布居数分别占相应能级初始布居数的0.35,0.28和0.31.在LiH+CO2碰撞中,激发v″=15态后,测量了v″=12,J″=5能级布居数的时间演化轮廓,观察到了明显的双峰结构,这是发生共振过程LiH(15,0)+CO2→LiH(12,5)+CO2(001)的直接证据.The vibrational level of LiH（X1E＋,v＂ =0） is generated in the reaction of Li（2p） and H2. Vibrational state total relaxation rate coefficients, kv（M）, for LiH（v＂ =9-15） by M=H2 and COs have been investigated in a pump-probe configuration. At v＂ =9, 10,11 and 12, the rate coefficients kv（M） increase linearly with vibrational quantum number. This linear region is dominated by single quantum relaxation （△v=1） collisionai propensity rules. The region（v＂ =13,14 and 15） where the dependence is much stronger than linear has significant contribution from multiquantum（△v≥2） relaxation or resonant vibration-vibration energy transfer between highly vibrationally excited LiH and H2 or 602. For v＂ =13,14 and 15, 0.35, 0.28 and 0.31 of the initially prepared population undergo two-quantum （△v=2） vibrational relaxation in LiH（v＂ ）-bH2 collisions. In LiH（v＂ ）＋ CO2, the time profile of v＂ =12 after preparation of v＂ --15, J＂ =5 was measured. A clear bimodal distribution is observed. It is direct evidence for resonance in LiH（15,0）＋CO2→LiH （12,5）＋- CO2 （001）.

关 键 词：振动能量转移 泛频激发 多量子弛豫 高位振动态 LIH CO2 

分 类 号：O561.5[理学—原子与分子物理]