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根据自由电子气模型，提出了一种用于计算原子激发态能级的Ｘ＿ａ交换参数的理论模型。用该模型计算了Ｎａ原子主线系４ｐ～１５ｐ的激发态能级，计算结果基本符合实验测量值。
According to the free electron gas model, a theoretical model of X_a exchange parameter for calculating the energy level of atomic excited states is proposed. Using this model, the energy level of 4p ~ 15p in the main line of Na atom has been calculated. The calculated results are in good agreement with the experimental values.