【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.更多还原

【Abstract】 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.更多还原