Dissociation Energies for Small Carbon Cluster Ions (C2-19+) Measured by Collision-Induced Dissociation
Dissociation Energies for Small Carbon Cluster Ions (C2-19+) Measured by Collision-Induced Dissociation
复制标题
通过碰撞诱导解离测量小碳簇离子 (C2-19) 的解离能
DOI：
10.1021/j100027a010
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
S. Anderson
中科院分区：
文献类型：
--
作者：
Marianne B. Sowa;P. A. Hintz;S. Anderson
用碰撞诱导解离（CID）方法研究了碳团簇离子Cn+（n= 2-19）的稳定性和碎裂行为.测量的绝对CID截面，片段外观电位，和片段分支比。通过拟合数据，提取了每种团簇大小的解离阈值能量。阈值能量随团簇尺寸的变化有很大的波动。小团簇的稳定性表现出较强的偶/奇交替，计算结果与理论离解能符合得很好。对于较大的集群的周期性的四个原子，叠加在整体上减少的稳定性，随着尺寸的增加。对于大多数集群大小的主要碎裂通道是C3的损失。对于C15+、C16+和C19+，五个原子的损失是主要通道，在C16+和C19+的情况下占主导地位。
We report a collision-induced dissociation (CID) study of the stability and fragmentation behavior of carbon cluster ions, C „+(n= 2—19). Measurements were made of the absolute CID cross sections, fragment appearance potentials, and fragment branching ratios. Dissociation threshold energieshave been extracted for each cluster size by fitting the data. The threshold energies fluctuate strongly with cluster size. Small clusters show strong even/odd alternations in stability, and the results are in good agreement with theoretical dissociation energies. For larger clusters a periodicity of four atoms is observed, superimposed on an overall decrease in stability with increasing size. For most cluster sizes the dominant fragmentation channelis loss of C3. For Ci5+, Ci6+, and Ct9+, loss of five atoms is a major channel, dominant in the case of C] 6" andC] 9+.