潮湿空气微波放电离子形成动力学  

Ion Formation in Microwave Discharge through Moist Air

作　　者：程平[1] 王鸿梅[1] 李建权[1] 张为俊[1] 纪玉峰[1] 王振亚[1] 盛六四[2] Patrik Spanel David Smith 曹德兆[1] 储焰南[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所环境光谱学实验室,合肥230031 [2]中国科学技术大学国家同步辐射实验室,合肥230026 [3]Centre for Science and Technology in Medicine,Keele University

出　　处：《物理化学学报》2002年第3期232-236,共5页Acta Physico-Chimica Sinica

基　　金：中国科学院创新项目;中国科学院/英国皇家学会联合项目;中国科学技术大学合肥高等研究院资助项目~~

摘　　要：利用微波放电电离质谱装置,通过水蒸气与空气混合气体(潮湿空气)的微波放电,同时获得了化学电离质谱探测技术中常用的三种重要母体离子H3O+、NO+和O2+.结合潮湿空气中主要成分N2、O2以及水蒸气各自微波放电后的质谱探测结果,对潮湿空气微波放电后上述三种离子产生的动力学过程进行了分析,并给出了各种离子的形成机制.这些离子-分子反应过程在计算机模拟中得到了进一步的证实.A quadrupole mass spectrometer was used to diagnose the ionic products from the microwave discharge through a mixture of air and water vapor. H3O+, NO+ and O-2(+), important primary reagent ions in the chemical ionization mass spectrometry (SIFT-MS) were observed at ionic beam current of up to 10 nA. The formation mechanisms for the above ions generated in the discharge were analyzed in conjunction with the ions detectied in the cases of N-2, O-2 and H2O microwave discharges, respectively. Thus, various ion-molecule reactions involving the primary ions N-2(+),. N+, O-2(+), O+, H2O+ and OH+ were proposed to be responsible for the formation of H3O+, NO+ and O-2(+), which were also demonstrated by computer simulation based on such ion-molecule reactions.

关 键 词：离子源 微波放电 离子化学 动力学 潮湿空气 化学电离质谱 离子-分子反应 

分 类 号：O657.63[理学—分析化学]