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雾溪之魅

银虫 (小有名气)

[求助] 求助CCSD(T)问题 已有2人参与

大家好,我想请求一个问题,我用CCSD(T)计算单点能正常结束后,能量反而增加,更不准确了,是什么原因呢?
因为计算中冻芯出了问题,所有在关键词中加入了iop(8/11=1),请我是由于这个关键词造成的错误吗?
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雾溪之魅

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引用回帖:
7楼: Originally posted by zhou2009 at 2014-06-26 14:35:49
你用什么样的基组?

Def2-TZVPPD
8楼2014-06-26 14:42:58
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枪下游魂

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【答案】应助回帖

★ ★
感谢参与,应助指数 +1
gkf高: 金币+2 2014-06-26 22:53:07
IOp(8/11)
MO coefficient, orbital energy, and number of electrons test.
0 Default, same as 2 except for during BD iterations or BD=Read.
1 Just print a warning message.
2 Kill the job if any MO coefficients are greater than 1000.0 or the smallest difference between occupied and virtual orbital energies is less than 0.001. Also, kill a frozen-core job if there is significant core-valence mixing in the canonical orbitals.
00 Default, same as 10.
10 Suppress such a test (CPHF may still be done for such a case).
20 Kill the job if there is no corr. energy; e.g., if there is only 1 electron or 1 virtual spin-orbital.

根据iop(8/11=1)的描述,我觉得有一定关系,可能你的冻芯出现了选项2后面所说的那种情况。

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2楼2014-06-26 08:28:28
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雾溪之魅

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引用回帖:
2楼: Originally posted by 枪下游魂 at 2014-06-26 08:28:28
IOp(8/11)
MO coefficient, orbital energy, and number of electrons test.
0 Default, same as 2 except for during BD iterations or BD=Read.
1 Just print a warning message.
2 Kill the job if any MO c ...

嗯,这样啊,可是我要是不加上iop(8/11=1)的话就会出现l801 错误,请问这个错误还有别的解决方法吗?非常感谢
3楼2014-06-26 08:58:19
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雾溪之魅

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引用回帖:
2楼: Originally posted by 枪下游魂 at 2014-06-26 08:28:28
IOp(8/11)
MO coefficient, orbital energy, and number of electrons test.
0 Default, same as 2 except for during BD iterations or BD=Read.
1 Just print a warning message.
2 Kill the job if any MO c ...

你好,我刚刚还发现某些不加IOp(8/11)的CCSD(T)单点能结果也明显增大不对,这又是什么原因呢
4楼2014-06-26 09:02:56
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