U@C28: the electronic structure induced by the 32-electron principle
Literature Information
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.
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