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yuhuobuku(½ð±Ò+2,VIP+0):лл½»Á÷ 6-24 18:20
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yuhuobuku(½ð±Ò+3,VIP+0):лл½»Á÷ 6-24 21:45
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1. smaller basis set <= 6-31G for as many atoms as possible 2. select a functional: IF the system is highly conjugated (either C60 ball or the plan is conjugated), DO NOT choose b3lyp. try bhandhlyp or a mthod with higher HF exchange percentage. If you choose b3lyp for system with large part of conjugation/aromaticity, the price you pay is a very big basis set. 3. the most efficient way may be semi-empirical method such as PM6/ZINDO if the method contain all the transition metal you need. http://muchong.com/bbs/viewthread.php?tid=1324165&fpage=1 [ Last edited by c111999 on 2009-6-25 at 02:45 ] |
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