团簇碰撞中的相对转动研究

采用距离相关紧密束缚的分子动力学模型,研究了在不同碰撞能量以及不同的碰撞参数下,碱金属团簇碰撞过程中的转动行为.研究表明,团簇碰撞中存在着较大的转动.对确定的能量,存在极值的碰撞参数,小于该碰撞参数时,转动能量随碰撞参数增加而迅速增加;大于该碰撞参数时,转动能量随碰撞参数的增加迅速减小.能量低时,相对转动弛豫时间更长;碰撞能量越大,越过势垒的能力越强,势场的相对影响就越小,由此引起的相对转动也就越小.

Studies of Relative Rotations for Sodium Cluster Collisions

Using distance dependent tight binding molecular dynamics model (DDTB MD), the relative rotation processes in the sodium cluster collisions have been studied at the different incident energies and different impact parameters. It shows that for a given energy, there is a critical impact parameter. Under this impact parameter, the rotational energy increases rapidly with the increasing of the impact parameter, while above this parameter, the rotational energy decreases when increasing impact parameters. At lower energy, the relaxation time of the relative rotation is longer than that at higher energies.