Electron capture and dissociation of the molecule in slow collisions
Electron capture and dissociation of the molecule in slow collisions
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DOI：
10.1088/0953-4075/29/3/017
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发表时间：
1996-02
期刊：
影响因子：
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通讯作者：
A. Remscheid;B. Huber;M. Pykavyj;V. Staemmler;K. Wiesemann
中科院分区：
文献类型：
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作者：
A. Remscheid;B. Huber;M. Pykavyj;V. Staemmler;K. Wiesemann
研究了氮分子间（8 - 16 keV）慢碰撞的单电子捕获过程和多电子捕获过程。确定了解离通道和非解离通道的贡献以及（q = 1 - 6）离子碎片的动能。由碎片的动能推导出分子离子的解离能。在各向同性解离假设下，得到以下结果：单电子捕获最多7%导致解离成，双电子捕获至少90%导致分裂成。如果两个以上的电子被捕获，所有的离子解离成。对于偶数q，我们观察到r = s，否则；也就是说，r和s的最大差值是1。最接近最对称的电荷分布是首选的。测得的解离能比库仑爆炸模型的解离能要小。因此，本文计算了两种分子离子的电位曲线，并将其解离能与测量值进行了比较。在这两种情况下，从多电荷分子的最低分子状态解离似乎是最有可能的。
Single and multiple electron capture processes are studied in slow (8 - 16 keV) collisions between and molecular nitrogen. The contributions of dissociative and non-dissociative channels are determined as well as the kinetic energies of the fragments of the (q = 1 - 6) ions. From the kinetic energies of the fragments dissociation energies of the molecular ion are deduced. Under the assumption of isotropic dissociation the following results are obtained: at most 7% of single-electron capture leads to dissociation of into and at least 90% of the double-electron capture results in fragmentation into . If more than two electrons are captured, all -ions dissociate into . For even values of q we observe r = s, otherwise ; i.e. the maximum difference between r and s is 1. A charge distribution closest to the most symmetric one is preferred. The measured dissociation energies are smaller than those expected from the model of Coulomb explosion. Therefore, potential curves for the and molecular ions have been calculated, and dissociation energies deduced from these potential curves have been compared to the measured ones. In both cases dissociation from the lowest molecular state of the multicharged molecule seems most probable.