物理化学学报 >> 1997, Vol. 13 >> Issue (04): 328-334.doi: 10.3866/PKU.WHXB19970409

研究论文 上一篇    下一篇

CnSH±与CnS±2的碰撞诱导解离研究

唐紫超,石磊,黄荣彬,刘朝阳,郑兰荪   

  1. 固体表面物理化学国家重点实验室，厦门大学化学系，厦门 361005
  • 收稿日期:1996-09-10 修回日期:1996-11-26 发布日期:1997-04-15
  • 通讯作者: 郑兰荪

Collision-Induced Dissociation Studies of CnSH± and CnS±2

Tang Zi-Chao,Shi Lei,Huang Rong-Bin,Liu Chao-Yang,Zheng Lan-Sun   

  1. Department of Chemistry,Xiamen University,Xiamen 361005
  • Received:1996-09-10 Revised:1996-11-26 Published:1997-04-15
  • Contact: Zheng Lan-Sun

PDF

2347

赞

摘要：

 在自制的交叉分子-离子束串级飞行时间质谱仪上，以激光溅射的方式，产生了一系列含有一个硫原子和一个氢原子与含有两个硫原子的杂碳原子簇正负离子、经“质量门”选出单一质量的簇离子，与氮气的超声分子束交叉碰撞，然后分析其碰撞碎片. 研究结果确定了这些簇离子的结构，两个杂原子分别位于碳链的两端. 对碎片离子的分析还揭示了这些簇离子的主要解离通道及其与成簇碳原子数和所带电荷极性的关系，发现当成簇碳原子数较少时，簇离子中最薄弱的是S－C键; 随着碳链的增长，与硫原子相邻的C－C键变得更为薄弱；实验中存在着多次碰撞的机会，因而各碎片离子还有可能进一步解离.

关键词: CnSH±, CnS± 2, 碰撞诱导解离, 解离通道

Abstract:

On a home-made crossed ion-molecular beam tandem time-of-flight mass spectrometer, carbon cluster ions with two hetero-atoms, CnSH± and CnS2±, were produced from laser ablation, mass-selected, and collided with pulsed nitrogen beam. From mass analysis of the fragment ions, structures of the cluster ions were characterized as linear, with two hetero-atoms locating on both ends of the carbon chain. The experimental results also revealed the main dissociation channel of the cluster ions. According to the results, for most cluster ions studied in the experiment, the weakest bond is the C-C bond next to the sulfur atom, but in some smaller cluster ions, S-C bond is easier to break. Under the experimental condition, cluster ions may suffer multiple collisions, so fragment ions produced from stepwise dissociation process were observed.

Key words: CnSH±, CnS± 2, Collision-induced dissociation, Dissocition channel