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yan824木蟲 (小有名氣)
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[交流]
【求助】b3lyp和bp8 已有2人參與
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| b3lyp和bp86兩種方法在計算分子的多重態(tài)時有何不同?那種酸多重態(tài)能好一些?b3lyp*是什么?用gaussian03能算嗎? |
木蟲 (小有名氣)
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"b3lyp和bp86兩種方法在計算分子的多重態(tài)時有何不同?那種算多重態(tài)能好一些?" 沒有比較過,不同體系可能得到不同的結(jié)果,沒有啥標準的。b3lyp只是很常用罷了,但b3lyp不是萬能的,可能對你的體系就不一定就合適,你需要自己比較選擇。 “b3lyp*是什么?用gaussian03能算嗎?” b3lyp*: the amount of Hartree-Fock exchange is reduced from 20% to 15% in comparison with b3lyp. G03應(yīng)該能算,你可以讀下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 |
木蟲 (小有名氣)
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