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[求助] 审稿人对我只用B3LYP有意见

审稿人意见：B3LYP is a functional known to have very large exact exchange component (20%) favoring too loose electron densities and low transition energies. State-of-the-art is to at least use also a functional of the GGA class with zero exact exchange, which will give an impression of the error/spread obtainable from DFT, currently not described.
我的回答：B3LYP, as a hybrid functional parameterized to fit data primarily for main group molecules, has achieved outstanding accuracy and has been widely used in theoretical chemistry calculation. However, B3LYP is known to have very large exact exchange component (20%) favoring too loose electron densities and low transition energies. So, using the pure functional BP86 is necessary, which is a GGA class with zero exact exchange (0%). It can provide another side of the coin. So, we have also performed the geometry optimization, vibrational analysis and excited states calculation using pure functional BP86. The results have been added into the new version of manuscript.

本人纯属量化菜鸟，有个问题，请高手指点：
1、B3LYP中的20%交换相关项是什么?
2、为什么要用纯的泛函BP86来验证?

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