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yan824

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[交流] 【求助】b3lyp和bp8 已有2人参与

b3lyp和bp86两种方法在计算分子的多重态时有何不同?那种酸多重态能好一些?b3lyp*是什么?用gaussian03能算吗?
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caipingl

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小木虫(金币+0.5):给个红包,谢谢回帖交流
"b3lyp和bp86两种方法在计算分子的多重态时有何不同?那种算多重态能好一些?"
没有比较过,不同体系可能得到不同的结果,没有啥标准的。b3lyp只是很常用罢了,但b3lyp不是万能的,可能对你的体系就不一定就合适,你需要自己比较选择。

“b3lyp*是什么?用gaussian03能算吗?”
b3lyp*: the amount of Hartree-Fock exchange is reduced from 20% to 15% in comparison with b3lyp.
G03应该能算,你可以读下manual,用iop指定

G09 manual:
User-Defined Models. Gaussian 09 can use any model of the general form:
    P2EXHF + P1(P4EXSlater + P3ΔExnon-local) + P6EClocal + P5ΔECnon-local

The only available local exchange method is Slater (S), which should be used when only local exchange is desired. Any combinable non-local exchange functional and combinable correlation functional may be used (as listed previously).

The values of the six parameters are specified with various non-standard options to the program:

    *

      IOp(3/76=mmmmmnnnnn) sets P1 to mmmmm/10000 and P2 to nnnnn/10000. P1 is usually set to either 1.0 or 0.0, depending on whether an exchange functional is desired or not, and any scaling is accomplished using P3 and P4.
    *

      IOp(3/77=mmmmmnnnnn) sets P3 to mmmmm/10000 and P4 to nnnnn/10000.
    *

      IOp(3/78=mmmmmnnnnn) sets P5 to mmmmm/10000 and P6 to nnnnn/10000.

For example, IOp(3/76=1000005000) sets P1 to 1.0 and P2 to 0.5. Note that all values must be expressed using five digits, adding any necessary leading zeros.

Here is a route section specifying the functional corresponding to the B3LYP keyword:

#P BLYP IOp(3/76=1000002000) IOp(3/77=0720008000) IOp(3/78=0810010000)

The output file displays the values that are in use:

IExCor=  402 DFT=T Ex=B+HF Corr=LYP ExCW=0 ScaHFX=  0.200000
ScaDFX=  0.800000  0.720000  1.000000  0.810000

where the value of ScaHFX is P2, and the sequence of values given for ScaDFX are P4, P3, P6 and P5.

So for b3lyp*, it should be
#P BLYP IOp(3/76=1000001500) IOp(3/77=0720008000) IOp(3/78=0810010000)

And you can read this paper: Theor. Chem. Acc., 2001, 107, 48-55
2楼2011-01-29 03:11:20
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yan824

木虫 (小有名气)

引用回帖:
Originally posted by caipingl at 2011-01-29 03:11:20:
"b3lyp和bp86两种方法在计算分子的多重态时有何不同?那种算多重态能好一些?"
没有比较过,不同体系可能得到不同的结果,没有啥标准的。b3lyp只是很常用罢了,但b3lyp不是万能的,可能对你的体系就不 ...

谢谢啊!我试试!!
3楼2011-01-29 10:32:57
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yan824

木虫 (小有名气)

引用回帖:
2楼: Originally posted by caipingl at 2011-01-29 03:11:20:
"b3lyp和bp86两种方法在计算分子的多重态时有何不同?那种算多重态能好一些?"
没有比较过,不同体系可能得到不同的结果,没有啥标准的。b3lyp只是很常用罢了,但b3lyp不是万能的,可能对你的体系就不 ...

ms3/77的有错误啊!
4楼2011-11-22 18:24:51
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