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。
The electron gas screening on Coulomb potential can be weakened greatly when Landau level filling factor is an even number.
当填充因子为偶数时，其本征能量的绝对值最大，此时电子气对库仑势的屏蔽效应最弱。
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