The Hamiltonian of sodium atom is reduced by using screening Coulomb potential, and the energy levels of sodium atom are calculated by means of twofold perturbation.

用屏蔽库仑势简化了钠原子的哈密顿，用两次微扰法计算了钠原子的能量，结果与实验值符合得较好。

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The equation of motion of two-electron atom in 3-D space is transformed into that of one-electron atom in 6-D space, subjected to generalized Coulombic potential.

将二电子原子在三维空间中的运动转化为单电子原子在六维空间中受广义库仑力作用的运动。

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Then there is the Atomium, a giant-sized more-or-less model of an atom put up in 1958 as a tribute to the potential of the nuclear age.

ECONOMIST: The EU and Brussels