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北京石油化工学院2026年研究生招生接收调剂公告
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hee_csu

新虫 (著名写手)

[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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hee_csu

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先自己顶一下
今天有点凉
2楼2011-10-23 10:30:19
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hee_csu

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先自己顶一个
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3楼2011-10-23 10:37:10
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yongleli

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小红豆(金币+3): 感谢分享 2011-10-23 11:09:58
hee_csu(金币+10): 非常感谢,还望继续指教。 2011-10-23 14:43:20
引用回帖:
1楼: Originally posted by hee_csu at 2011-10-23 10:13:26:
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 ...

审稿人是说,你用的是混合泛函,但是现在公认B3LYP计算反应能会偏低。
而且他们说,B3LYP计算得到的电子云过于离域化了,
所以让你用纯泛函验证一下,电子结构是不是你report的那么回事,
你计算得到的反应能是不是由于B3LYP误差相消,
导致你计算的值碰巧跟实验值对上了。
你必须证明你的计算原理正确、不是误差相消碰巧弄出来的。
4楼2011-10-23 10:55:08
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yongleli

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小红豆(金币+2): 感谢分享 2011-10-23 11:10:13
hee_csu(金币+5): 放了电子轨道图,请继续指点,非常感谢。 2011-10-23 14:46:47
引用回帖:
1楼: Originally posted by hee_csu at 2011-10-23 10:13:26:
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 ...

还有,你如何证明你计算得到的电子结构是正确的(你放了电子轨道图在文章里吗?)。
5楼2011-10-23 10:56:06
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lyy880530

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我的审稿意见也是这个意思, it is well known that the B3LYP tends to favor high spin states over low spin states. This is due to the HF exchange energy mixture that has this intrinsic feature and it should always be properly calibrated. One way to do this would be to compare the hybrid vs pure GGA functionals and check the energy difference between the quintet and the septet states. Or by smoothly change the quantity of HF exchange and look at the energy gap. Did the authors check this ? This can be quite important because along the reaction energy path you may get “earlier” or “later” spin-crossing.
看到你的帖子了,正好想请教你一下
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6楼2011-10-23 11:29:36
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hee_csu

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引用回帖:
5楼: Originally posted by yongleli at 2011-10-23 10:56:06:
还有,你如何证明你计算得到的电子结构是正确的(你放了电子轨道图在文章里吗?)。

是的,我放了轨道图在文章中。我用得到的结构参数与实验值相比较,比较接近,所以认为合理。

后来用BP86在同样的理论水平下计算了该结构,得到的结构参数及吸收光谱与用B3LYP得到的结果很接近,是不是可以说计算是合理的。请高手指点,非常感谢!
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7楼2011-10-23 14:41:21
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beefly

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gmy1990(金币+2): 2011-10-23 16:01:27
hee_csu(金币+5): 虽然不明白你说的,还是要谢谢你。 2011-10-24 20:09:32
20%不是交换相关项,和密度泛函里的交换泛函、关联泛函没有关系。20%是精确交换项的因子,精确交换项具有Hartree-Fock的形式,所以有些文章也称之为HF项(不过这个称呼不准确)。所有杂化泛函都有这一项。
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8楼2011-10-23 15:14:08
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lihb734

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站在计算化学入门的门槛上

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zhou2009(金币+3): 2011-10-24 15:47:09
引用回帖:
6楼: Originally posted by lyy880530 at 2011-10-23 11:29:36:
我的审稿意见也是这个意思, it is well known that the B3LYP tends to favor high spin states over low spin states. This is due to the HF exchange energy mixture that has this intrinsic feature and it ...

你早说这个,我就明白了。审稿人的意思,需要你做一个能差与精确交换含量的关系。
你可以测试一下BLYP, B3LYP, BHANDHLYP,看看HF%的影响。期间,你还可调调HF的成分。
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9楼2011-10-24 13:54:23
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qzhaosdu

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zhou2009(金币+2): 2011-10-24 15:48:01
正如楼上所说,你最好做一个测试,变换B3LYP里HF势的系数,看看你计算的性质跟这个系数有没有关系,没有最好。有些体系那个系数变了结果差别很大的,比如Cu+-H2O。至于怎么变,置顶帖子里有。
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10楼2011-10-24 15:38:07
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