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"b3lypºÍbp86Á½ÖÖ·½·¨ÔÚ¼ÆËã·Ö×ӵĶàÖØÌ¬Ê±Óкβ»Í¬£¿ÄÇÖÖËã¶àÖØÌ¬ÄܺÃһЩ£¿" ûÓбȽϹý£¬²»Í¬Ìåϵ¿ÉÄܵõ½²»Í¬µÄ½á¹û£¬Ã»ÓÐɶ±ê×¼µÄ¡£b3lypÖ»ÊǺܳ£ÓðÕÁË£¬µ«b3lyp²»ÊÇÍòÄܵģ¬¿ÉÄܶÔÄãµÄÌåϵ¾Í²»Ò»¶¨¾ÍºÏÊÊ£¬ÄãÐèÒª×Ô¼º±È½ÏÑ¡Ôñ¡£ ¡°b3lyp*ÊÇʲô£¿ÓÃgaussian03ÄÜËãÂ𣿡± b3lyp£ª: the amount of Hartree-Fock exchange is reduced from 20% to 15% in comparison with b3lyp. G03Ó¦¸ÃÄÜË㣬Äã¿ÉÒÔ¶ÁÏÂmanual£¬ÓÃiopÖ¸¶¨ G09 manual£º User-Defined Models. Gaussian 09 can use any model of the general form: P2EXHF + P1(P4EXSlater + P3¦¤Exnon-local) + P6EClocal + P5¦¤ECnon-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 |
2Â¥2011-01-29 03:11:20
yan824
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3Â¥2011-01-29 10:32:57
yan824
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4Â¥2011-11-22 18:24:51









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