Mn/Se,MnO_2/Se和Mn/SeO_2体系形成的团簇离子的质谱研究  

A Study of Mn-Se and Mn-O-Se Cluster Ions Using Mass-spectrometry

作　　者：陈云清[1] 邢小鹏[1] 刘鹏[1] 曾嵘 高振[1] 朱起鹤[1] 

机构地区：[1]分子反应动力学国家重点实验室分子科学中心中国科学院化学研究所,北京100080

出　　处：《高等学校化学学报》2000年第5期743-746,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金!(批准号:29773054)

摘　　要：用飞行时间质谱法研究了激光直接溅射 Ｍｎ／Ｓｅ混合样品产生的二元团簇、团簇的光解行为及溅射ＭｎＯ２／Ｓｅ和 Ｍｎ／ＳｅＯ２样品产生的团簇正负离子．在 Ｍｎ－Ｓｅ二元团簇中，（Ｍｕｓｅ）ｎ＋是正离子的主要组分，［（Ｍｕｓｅ）ｎＳｅ］－是负离子的主要组分．当ｎ<５时，（Ｍｕｓｅ）ｎ＋的紫外光解有多种通道； ｎ≥５时光解以剥落ＭｕＳｅ方式进行．激光直接溅射 ＭｎＯ２／Ｓｅ， Ｍｎ／ＳｅＯ２两种体系产生的正负离子极为相似，符合团簇的气相聚合生长机理．正离子中（Ｍｎｏ）ｎ＋是主要组分，负离子中Ｓｅｎ－，（ＳｅＯ）－和（ＳｅｎＯ３）－是主要组分．Time-of-flight mass spectrometry was used to study Mn-Se and Mn-O-Se cluster ions produced by laser direct vaporization of solid samples. In Mn-Se binary cluster ions, (MuSe)n+ is the main composition of positive cluster ions, while [(MuSe)nSe]- is the main composition of negative cluster ions. When a mass-selected (MuSe)n+ was photolyzed, the photolysls produt ions have the same general composition (MuSe)m+. In Mn-O-Se ternary system, the main positive cluster ions produced are Mn-O binary clusters, in which [(MnO)n]+ has a high intensity, while the negative cluster ions include Sen-[SenO]-, [SenO3]- and [MnSen]-. It seems that the cluster ions were produced by the vaporization of solid sample and this conforms to a gas-phase aggregation mechanism.

关 键 词：紫外光解 锰 二元团簇离子 氧族元素 质谱 

分 类 号：O614.711[理学—无机化学] O613.5[理学—化学]