分子束条件下NO(A, B, a)态产物的分支比研究(英)  

Study on the Branching Ratio of Product NO (A, B, a) in Molecular Beams

作　　者：沈关林[1] 陈宏[1] 徐大东[1] 李学初[1] 楼南泉[1] 

机构地区：[1]中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连116023

出　　处：《Chinese Journal of Chemical Physics》1998年第6期501-508,共8页化学物理学报（英文）

基　　金：国家自然科学基金

摘　　要：在相对碰撞平动能为0．05eV的分子束实验条件下，研究了CO（a）＋NO（X）的E－E传能通道。通过测量观测区域的发射光谱，求得了反应物CO（a，v）的相对振动布居。利用计算机模拟传能产物NO（A－X）和NO（B－X）的发射光谱求得了它们初生态的相对振动布居、转动温度以及传能通道的分支比γ／β＝1．3±0．3。同时提出传能是经过中间复合物OCNO过程可用电子交换机理进行解释。利用NO（B2Π，v'＝0，J'＝10．5，／a4Π，v'＝8，J'＝10．5）“门道”传能的磁场“冻结”效应，首次在实验上成功地证实了传能产物亚稳态NO（a）的存在。根据“门道”传能的发射强度与NO（B－X）的发射强度之比，求得了传能产生“暗”、“明”通道NO（a，v'＝8）／NO（B，v'＝0）的分支比为2。因此，CO（a）＋NO（X）的电子传能除生成NO（A，B）辐射态外，生成亚稳态NO（a）也是一个重要的传能通道。The E-E energy transfer reaction CO (a3Π, v')+NO (X2Π, v'=0) was studied under single collision conditions. The rovibrational distributions of the products NO(A/B) and the branching ratio γ/β have been obtained for a particular CO (a, v') vibrational excitation. The production of metastable No (a4Π) by E-E transfer of metastable Co (a3Π) to No (XΠ), has been firstly demonstrated in the present experiment. The elusive NO(a) product was detected by its spontaneous emission from singular, so-called levels, which couple the quartet and the doublet manifolds.It was shown that the formation of NO (a4Π) is a major product channel of the CO (a)+NO(X) reaction, besides those leading to NO(A) and NO(B). A reaction mechanism of electron exchange was proposed.

关 键 词：E-E传能 产物分支比 分子束 一氧化碳 一氧化氮 

分 类 号：O613.71[理学—无机化学] O613.61[理学—化学]