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库仑积分(英语:Coulomb integral),又称α积分,是原子轨道线性组合分子轨道时,通过变分法求得的久期方程组包含的三类积分之一,通常用HAA和HBB表示[1]

对于双原子分子,由于久期方程组矩阵形式为:

所以,根据表达式可得:

代入表达式推导可知[1]

其中E0为基态原子能量,

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