Firstly, Ab initio quantum chemistry calculations of Be~+He_n (n=1-12), Mg~+He_n (n=l-10) and Mg~(2+)He_n (n=1-10) complexes are performed using GAUSSIAN03 software package.

• 而Mg~(2+)He_n(n=1-10)离子团簇具有更高的对称性，二价镁离子总被氦原子包围于中心。