一些双电荷离子的气相碎裂反应  

Fragmentations of Some Doubly Charged Ions in the Gas Phase

作　　者：詹东亮 朱育芬[1] 刘淑莹[2] 辛保民[2] 贾维平[2] 张法义[3] 黄承义[3] 孙宏伟[3] 

机构地区：[1]中国科学院广州化学研究所 [2]中国科学院长春应用化学研究所,长春130022 [3]南开大学中心实验室

出　　处：《高等学校化学学报》1993年第9期1270-1274,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

摘　　要：借助质量分析离子动能谱和串联质谱研究了由电子轰击产生的双电荷离子的单分子亚稳碎裂及碰撞诱导分解过程,讨论了两种实验方法导致的差别因素.此外,根据质量分析离子动能谱提供的双电荷离子电荷分离反应的动能释放值计算了两电荷中心间距的最小值,以判别按不同电荷分离方式碎裂的双电荷离子的过渡态结构.The unimolecular fragmentation and collision-induced dissociation (CID) of doubly charged ions generated by electron impact (EI) were studied by mass analyzed ion kinetic energy spectrometry(MIKES) and tandem mass spectrometry(MS/MS). The factors leading to the differences between the experimental results from above two methods mainly include ion kinetic energy and analyzer types. In addition, the intercharge distances of doubly charged ions at the moment of fragmentation were approximately calculated on the basis of the kinetic energy releases given by MIKES for charge separation reactions, which can be used to distinguish the transition structures of doubly charged ions fragmenting in different charge separaton ways.

关 键 词：双电荷离子 串联质谱 苯胺 硝基苯 

分 类 号：O561.4[理学—原子与分子物理]