CH3NO2与He（2^3S）,Ne（^3P0.2）的解离激发反应

Dissociative Excitation of CH_3NO_2 by Collisions with He(2~3S) and Ne(~3P_(0.2))

利用分子束和化学发光技术，在单次碰撞条件下，首次研究了亚稳态原子He（23S）、Ne（3P0．2）与CH3NO2的解离激发反应，探测到反应的激发态产物（CH（A）、CH（B）、CH（C）的化学发光，在He（23S）／CH3NO2反应中同时探测到H（Balmer）的发射．利用He（23S）＋N2→N2＋（B）＋He＋e－作参考反应，测定了反应He（23S）／CH3NO2产生的CH的A－X，B－X，C－X以及H原子的发射速率常数．利用化学发光光谱的计算机模拟，求得了激发态产物CH（A）的初生态振动布居和转动温度．结合相空间理论对解离过程CH（A）的形成通道进行了讨论，认为CH（A）的形成是经由中间体CH3*的二体解离过程．

Dissodative excitation of CH3NO2 by collision with He(23S) and Ne(3Po.2)has been stndied respectively by observing CH(A2△→ X2п,B2→ X2п) andC2 → X2п and H (Balmer) (ouly in the He(23S)/CH3NO2 reaction) emissions inthe beam apparatus under single collision. The emission rate constants of A - X, B - Xand C - X of CH and H produced from the He(23S)/CH3NO2 reaction were determinedby using the reference reactfon method. The nascent vibrational distributbes and rotational temperatures of CH(A) were determined through computer simulation assumming aBoltzmann rotationai distribtuion. The dissociative process and the formation mechanismof CR(A) were studied, and a two-body dissociative process through an intermediate CH3for CH(A) was suggested.