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A New Product Channel in the Energy Transfer of CO( a,v')+ NO(X)
Zhang Lei, Zhang Min, Li Xuechu, Wang Xiuyan, Shen Guanlin*
State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023
Abstract:
Under single-collision conditions,a beam of metastable molecules CO( a,v')generated by DC discharge was allowed to collide with a beam of NO(X)at a fixed angle of 90o . The collision-induced emission from the interaction region was collected at right angles to the beam plane by a lens set and dispersed by a 1 m monochromator where a cooled photomultiplier tube was mounted on the exit slit. The signal from the PMT was transmitted via a discriminator,a photon counter and a boxcar integrator into a computer for storing and processing. Two broadband emissions were observed around the wavelengths of 780 and 860 nm,which can be assigned to NO(b-a) Ogawa bands Δv = + 4 and + 3 sequences,respectively,and referred to the spectroscopic data given by Huber. At the collision energy of 0. 05 eV in the present experimental conditions,the electronic energy of CO( a,v' = 0)(6. 01 eV)was not enough to excite NO(X)to NO(b,v' = 4,5)(ΔE > 6. 11 eV). So,what was in act in the energy transfer was the vibrational excitation of CO(a,v' > 0),and the higher the vibrational excitation of CO(a,v') was,the stronger the emission intensity of NO( b-a)could be obtained. It is thought that electron exchange between CO(a)and NO(X)may be operative through the formation of a complex OCNO. The newly discovered formation of NO( b)channel could be well explained considering the energy conservation,spin conservation and electron exchange mechanism.
Key words:  Single collision,Energy transfer,Electron exchange mechanism
FundProject:
CO( a)+ NO(X)传能体系中的新传能通道
张雷, 张敏, 李学初, 王秀岩, 沈关林*
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
摘要:
在相对碰撞平动能为0. 05 eV 的分子束实验条件下,研究了亚稳态CO( a)+ NO(X)的E-E 传能通道.通过测量和分析交碰区的传能发射光谱,在780 和860 nm 处观测到了NO(b - a)跃迁Ogawa 带的Δv = + 4 和Δv = + 3 序的发射光谱. 从而首次在实验上直接证实了传能过程中第四通道的存在(CO(a)+ NO(X)→CO(X)+ NO(b)). 这一通道的发现解释了前人测量到的在CO(a)与NO(X)碰撞传能过程中CO( a)的猝灭速率远大于NO(A,B)生成速率的实
关键词:  分子间传能  传能通道  单次碰撞
DOI:10.1088/1674-0068/17/1/10-14
分类号: