弱束缚三体离子原子体系Li^+-~4He_2的能级和结构

Energies and structure of weakly bound three-body Ion-atom Li^+-~4He_2 system

采用耦合道超球坐标方法和B样条函数系统细致地研究了Li^+-~4 He_2体系束缚能级和结构,计算了体系的基态束缚能和结构以及部分激发态的束缚能量,获得了较高精度的基态能量和结构参数,并首次报道了部分激发态的束缚能.通过研究极化修正项的作用,发现三体极化修正项对系统的能量和结构都有着细小的影响,使得束缚能量比没有考虑其时更低,能量大约变化1%,使得基态的结构更加扁平,即其使得体系束缚的更为紧密.

The couple-channel hyperspherical method with B-spline function has been expanded to study the Li~＋-~4 He_2 system and demonstrated to be an effective and reliable method to study these weakly interacting ion-atomic three-body systems.Ground state energy and spatial features of these atom-atom-ion systems are investigated systematically together with bound energies of several excited states presented for the first time.The three-body polarization correction term,which is neglected in previous work,is taken into account for the interaction of the three particles in system.It is found that the contribution of three-body polarization correction on ground energies are subtle and make the system bind more tightly while the increments of ground energies are less than 1%.The polarization correction also make subtle modification in the geometric behaviors for these combinations.