然而密度泛函理论虽然在实际应用中取得了很大的成功,但是它一般来说并不能足够准确的预测分子能量相关的实验值。而且分子中原子数目的越多,计算值与实验值偏差就越大大,其原因就在于DFT中的固有近似。
精确交换相关泛函(XC泛函)决定了DFT计算结果的准确度,然而精确交换相关泛函是不知道的,所有的 DFT计算均使用近似交换相关泛函,这就更加扩大了计算结果的偏差,因此寻找更加精确的交换相关泛函对提高 DFT 计算精度有着重要的使命意义。这对于密度泛函理论的校正有一定的正面效果与积极意义。
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