快速C_(60)离子团在固体中的库仑爆炸过程Ⅱ分子动力学模拟

COULOMB EXPLOSIONS FOR SWIFT C_(60) ION-CLUSTERS PENETRATING IN SOLIDSⅡ THE MOLECULAR DYNAMICS SIMULATIONS

研究了快速C60 离子团与固体材料的相互作用过程 .借助于线性介电响应理论及等离子 极点近似介电函数 ,推导出作用在团簇中单个离子上的动力学相互作用力 ,并建立了一套描述离子团中单个离子运动的方程组 .通过数值求解运动方程组 ,可以发现 ,对于高速C60 离子团在固体中穿行时 ,由于动力学相互作用力的影响 ,使得库仑爆炸图形呈现出很强的非球对称性 ,即离子团中的导航离子群爆炸得较快 。

We study the interaction of the swift C 60 ion\|clusters with solids. The dynamic interacting forces acting on the individual ions in the cluster are derived based on the linear\|response dielectric theory with the PLA dielectric function, and a set of equations describing the motion of the individual ions is obtained. It has been shown that by solving the equations of the motion, the wake effects of the dynamic interactions result in the strong asymmetric structures of the high\|velocity C 60 clusters, i.e., the leading ions in the cluster explode very fast, while the trailing ions in the cluster almost remain in stable states.