Experimental studies of fusion and fragmentation of fullerenes
Experimental studies of fusion and fragmentation of fullerenes
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DOI：
10.1088/0953-4075/29/21/025
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发表时间：
1996-11-14
影响因子：
1.6
通讯作者：
Campbell, EEB
中科院分区：
文献类型：
--
作者：
Rohmund, F;Glotov, AV;Campbell, EEB
测量了C-60(+) + C-60、C-60(+) + C-70和C-70(+) + C-70碰撞的聚变截面能量依赖关系。在尖锐的能垒V-B以上的能量发生核聚变。聚变势垒位于60 ~ 80 eV之间的区域，并随着参与碰撞的原子数量的增加而增加。对于超越势垒的能量，聚变反应截面随着碰撞能量的增大而增大到最大值，然后迅速减小。高激发聚变化合物在实验时间尺度上发生衰变，并研究了碰撞能量的函数破碎模式。对于能量高达200ev的碎片行为，可以根据热聚变产物中C-2单元的连续蒸发来建模。在更高的能量下，这个模型就失效了，必须调用另一种分裂机制。总体结果与量子分子动力学模拟和简单现象学聚变模型的预测非常吻合。
Energy dependences of the fusion cross section for the collisions C-60(+) + C-60, C-60(+) + C-70 and C-70(+) + C-70 have been measured. Fusion occurs for energies above a sharp energetic barrier V-B. The fusion barrier lies in the region between 60 and 80 eV and increases with increasing number of atoms participating in the collision. For energies beyond the barrier the fusion reaction cross section increases with collision energy to a maximum value and then decreases very rapidly. The highly excited fusion compound decays on the experimental timescale, and the resulting fragmentation pattern has been studied as a function of collision energy. For energies up to 200 eV the fragmentation behaviour can be modelled in terms of successive evaporation of C-2 units from the hot fusion product. At higher energies this model breaks down and another fragmentation mechanism has to be invoked. The overall results are in very good agreement with quantum molecular dynamics simulations and the predictions of simple phenomenological fusion models.