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cxc521

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[求助] 请教CCSD(T)-F12输入文件怎么写

请教CCSD(T)-F12输入文件怎么写?谢谢

[ 来自科研家族 木虫量化 ]
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beefly

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CCSD(T)-F12以及R21-CCSD(T)是比较便宜的近似CCSD(T)/CBS方法,能够用n-zeta级别的基组得到(n+1)-zeta基组级别的精度,但计算量只比普通n-zeta计算增加几倍,远远低于(n+1)-zeta。

如果是小分子,在gaussian中可以直接用(n+1)-zeta基组作CCSD(T)计算,基本上就是CCSD(T)-F12/n-zeta的精度,或者在此基础上做CBS外推。
beefly《西太平洋大学现代英汉词典》[bi:fli]牛肉一般地
5楼2012-04-28 22:36:34
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chrinide

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【答案】应助回帖

★
感谢参与,应助指数 +1
zhou2009: 金币+1 2012-04-28 12:31:10
Gaussian? CCSD(T)-F12?

If Gaussian, You are Dreaming......

If you have MOLPRO, you can do it
未知必须借由更深的未知去获悉,隐晦必须借由更深的隐晦来明了
2楼2012-04-28 09:39:08
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cxc521

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送鲜花一朵
谢谢您的回答 我投了一篇文章,用的DFT优化的结构CCSD(T)算的单点能,审稿人给的回复是“My major objection is that despite demonstrating that the DFT method chosen (BB1K with 6-311G(d,p)) is in substantial error compared to ab initio data, this approach is then used to generate the potential energy surface over which VTST is applied. If one uses a surface that is wrong, then one cannot hope to obtain realistic reaction rates: "garbage in: garbage out". If it is necessary to use DFT for computational expediency, then it is neccessary to identify a functional & basis set that reproduces high-level data. Alternatively, they may explore faster ab initio methods such as MPn, or perhaps local or F12 methods.”  他说的F12 不是CCSD(T)-F12吗?
3楼2012-04-28 09:46:30
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lihb734

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站在计算化学入门的门槛上

【答案】应助回帖

感谢参与,应助指数 +1
zhou2009: , +3 2012-04-28 12:31:42
审稿人的意思需要你比较BB1K/6-311G(d,p)和高水平方法,比如MP2,local-MP2,MP2-F12,如果机时允许,CCSD(T)是最完美的。来论证DFT的可靠性,然后DFT就可以用于别的体系
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4楼2012-04-28 11:09:58
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