作者机构:[1]School of Physics, Key Laboratory of Atomic and Molecular Physics of Shandong Province, Ludong University, Yantai 264025, China
相关基金:Project supported by the National Natural Science Foundation of China (Grant Nos. 10674114 and 10604045). The authors are indebted to Prof. Han Ke-Li for providing the code used in our calculation. All calculations for the present study were carried out at Shuguang 4000A Computer Centre of Ludong University.