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2Â¥: Originally posted by tawfischer at 2014-03-29 13:57:23
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The 1996 pure functional of Perdew, Burke and Ernzerhof , as made into a hybrid by Adamo . The keyword is PBE1PBE. This functional uses 25% exchange and 75% corr ...

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3Â¥2014-03-30 11:36:56
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tawfischer

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Àî·lulu: ½ð±Ò+20, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2014-03-30 11:37:00
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The 1996 pure functional of Perdew, Burke and Ernzerhof [Perdew96a, Perdew97], as made into a hybrid by Adamo [Adamo99a]. The keyword is PBE1PBE. This functional uses 25% exchange and 75% correlation weighting, and is known in the literature as PBE0.
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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.
ÉÏÃæ¸øµÄÊÇÈçºÎ×Ô¶¨ÒåB3LYPµÄ·½·¨£¬PBE0×ÔȻҪ´Ó´¿·ºº¯µÄÐÎʽPBEPBE³ö·¢×Ô¶¨Ò塣ʣϵÄ×Ô¼ººÃºÃÁìÎò£¬²»ÒªÔÙÎÊÁË¡£²»ÄÜÈñðÈËÊÖ°ÑÊÖÒ»²½Ò»²½½ÌÄ㣬Ӧ¸Ãѧ»á¶ÀÁ¢Ë¼¿¼¡£¿ÉÄÜÎÒ˵µÄ²»Ì«ºÃÌý£¬µ«Ï£ÍûÄãÄÜÀí½â¡£
2Â¥2014-03-29 13:57:23
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
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