氟原子与乙腈、丙腈反应化学发光研究

Study on Chemiluminescence from Reactions F Atom with CH_3CN and CH_3CH_2CN

我们研究了CF_4/Ar混合气体微波放电产生的基态F(~2P)原子与CH_3CN,CH_3CH_2CN发生的反应,观测了不同压力下两个反应的可见区(400～900nm)化学发光.获得了产物碎片HF≠(X),CN~*(A),CH~*(A,B)的发射光谱.并计算了CN(A→X)跃迁的Franck-Condon因子以及CN(A)态的振动布居.机理分析认为CN~*(A)是由次级反应产生的激发态分子(如CH_2CNF~*)离解而形成.

The chemiluminescence in the visible region (400～900nm) was measured from the reaction of F(~2P) atoms with CH_3CN and CH_3OH_2CN under low and high pressure conditions. Emissions were observed from vibrationally excited HF~≠(X) and from electronically excited CN~*(A) and CH~*(A, B). The Franck-Condon factors of GN(A→X) transitions was calculated, and the relative vibrational population of CN(A) was obtained. The formation mechanism of CN~*(A^2Ⅱ) was suggested by the dissociation of the activated molecule like (CH_2CNF)~*.