摘要
用四倍频YAG激光(266mm)把SO_2分子从电子基态X^1A_1激励到电子激发态A^1A_2和B^1B_1的高振动耦合区,通过检测自发辐射SO_2(B^1B_1→X^1A_1)的时间分辨信号,测定了室温(290K)下SO_2(A^1A_2,B^1B_1)被He,氯代甲烷分子和某些烷烃分子猝灭的速率常数.此外,还从碰撞配合物模型出发,对SO_2(A^1A_2,B^1B_1)的猝灭机制进行了讨论.
The quenching rate constants of SO2(A1A2,B1B1) by some molecules were measured by using laser excitation (at 266nm) of SO2 into the first allowed absorption region (240 ~340nm) and observation of time resolved fluorescence SO2(B→X) methods. In addition, the formation cross sections of complex between SO2 (A and B) and quenchers were calculated by using collision complex model. The results imply that the quenching of SO2(A,B) is probably controlled by the entrance - channel and might be mainly ascribed to the contribution of chemical reactions.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1998年第6期538-543,共6页
Acta Chimica Sinica
基金
国家自然科学基金资助课题(29473128)
关键词
二氧化硫
氯代甲烷
烷烃
猝灭
碰撞配合物模型
SO_2(A^1A_2,B^1B_1), chloromethane molecules, alkane molecules, quenching, collision complex model
