Paul阱中3～20个离子的有序构形

THE ORDERED STRUCTURES OF 3～20 IONS TRAPPED IN A PAUL TRAP

用分子动力学方法和ＭｏｎｔｅＣａｒｌｏ方法相结合，模拟了Ｐａｕｌ阱中离子体系的阻尼冷却，系统地得到了３～２０个离子的有序构形。结果表明：离子的晶相结构随着离子数目的增加呈现出有规律的变化；同时，晶相结构的有序构形与囚禁场的赝势阱形状具有几何相似性的关联。

By combining the approach of the molecular dynamics with Monte Calro, the damping cooling of ions in a Paul trap is simulated and the ordered structures of 3～20 ions are systematically obtained. It is shown that, the crystal structures of the ions vary ragularily with the increase of the number of ions. Meanwhild, there is a correlation of the geometric similarity between the crystal configuration of the ordered structure and the shape of the pseudopetential trap of the trapped field.