快速H+2在固体中穿行时产生的动力学相互作用力及库仑爆炸图形的演化

模拟了快速H⁺₂在固体中穿行时产生的库仑爆炸过程．作用在单个氢离子H⁺上的力分别由阻止力、屏蔽的库仑力及尾力所组成．借助于等离子-极点近似介电函数，屏蔽的库仑力和尾力可由线性介电响应理论来确定．假定在初始入射时分子轴相对入射速度方向的取向是随机的．模拟结果表明：由于动力学相互作用力的影响，分子离子在穿行过程中其分子轴的取向明显地偏向于入射速度的方向. 关键词：

DYNAMIC INTERACTING FORCE AND EVOLUTION OF COULOMB EXPLOSION PATTERNS FOR SWIFT H+2 PENETRATING THROUGH SOLIDS

We simulate the Coulomb explosion patterns for swift H⁺₂ ions penetrating through solids by solving the equations of motion. The forces acting on individual fragments are given by the stopping force and the dynamic interacting force. With the plasmon-pole approximation dielectric function, the linear-response dielectric theory is used to determine the dynamic interacting force. The initial directions of the molecular axis with respect to the beam direction are assumed to be random. It is found that due to the dynamic-interaction effects, the molecular axes tend to align to the beam direction and the energy losses of the trailing ions are larger than that of the leading ions.