title: U@C28: the electronic structure induced by the 32-electron principle.
abstract: First principles calculations show that the neutral U@C28 has a (cage)(2) ground state with Td symmetry instead of the long believed (5f)(1)(cage)(1) ground state with D2 symmetry. Its 34 valence electrons preferentially obey the 32-electron principle which fills all the s-, p-, d-, and f-type valence shells of the uranium atom. The remaining two valence electrons cannot break the electronic configuration and thus are located on the cage.
authors: Institute of Atomic and Molecular Physics, Jilin University, Changchun, 130012, People's Republic of China. wangzg@jlu.edu.cn.
authors: Xing
authors: X
authors: Dai
authors: Yang
authors: Y
authors: Gao
authors: Wanrun
authors: W
authors: Jiang
authors: Yanyu
authors: Y
authors: Lei
authors: Zhigang
authors: Z
authors: Wang