离子阱中碳原子簇离子的碰撞反应

Collision Reactions of Carbon Cluster Ions in a RE Ion Trap

用激光溅射法产生并在射频离子阱中囚禁了碳原子簇离子，进而利用离子阱的质量选择存储和离子存储时间长等特点，研究了经过选择存储的碳原子簇离子在离子阱中的碰撞解离和碰撞缔合。根据碰撞解离的结果以及碰撞前后的焓变，分析了团簇离子发生碰撞解离的条件和吸热范围，以及团簇离子的囚禁工作点与碰撞活化的关系。在此基础上，进一步研究了团簇离子碰撞解离后的各碎片之间发生缔合反应的过程，探讨了计算有效碰撞截面的方法。

Carbon cluster ions have been produced by laser ablation and stored in a RF ion trap. Taking the advantage of mass selective storage and long storage time of the ion trap, we have studied the collision induced dissociations and collision association reactions of  C + n cluster ions through the mass selective storage in the ion trap. According to the findings of collision induced dissociations and the variations of enthalpy before and after collisions, the conditions that collision induced dissociations can happen to cluster ions are obtained. And, the range of endotherm and the dependence of collision induced activations on trapping parameters of cluster ions are analyzed. Based on the above analyses, the processes of association reaction of ions produced through collision induced dissociations of cluster ions are further studied. The method of calculation of effective collision cross section is also investigated.