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小木虫论坛-学术科研互动平台 » 计算模拟区 » 量子化学 » Gaussian » 【求助】CPHF错误
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sizj

金虫 (正式写手)

[交流] 【求助】CPHF错误

在对较小的Re配合物进行激发态计算时正常，但是在对较大的Re配合物进行激发态计算时发生了CPHF错误报告：CPHF failed to converge in LinEq2，请问我应当怎么设定CPHF参数？谢谢！！

[ Last edited by sizj on 2009-2-22 at 14:49 ]
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1楼 2009-02-22 14:47:08
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sizj

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不知道，我在计算的时候没有进行设定。只是在算大体系的时候才出现这个提示，我找了一下，对CPHF的描述如下。我是初学，也看不太懂，所以想请教一下。
CPHF：


This keyword selects the algorithm used for solving the CPHF equations [435,436,437,438,439,440,441,442,443,444].



Grid=grid
Specify the integration grid for the CPHF portion of the calculation. The syntax is the same as for the Int=Grid option. The argument to this option may be a grid keyword (Fine, UltraFine, and so on) or a specific grid. See the discussion of Integral=Grid for full details on grid specification.

The default grid used depends on the one used for integral evaluation. If any specific grid is specified to the Integral keyword, then that grid is also used for the CPHF. Otherwise, when the latter uses the SG1 or Fine grid, the Coarse grid is used for the CPHF (a pruned (35,110)), and when UltraFine is used for the integrals, then SG1 is used for the CPHF. SG1 is the default grid for Polar=OptRot and Freq=Anharmonic.

RdFreq
Perform frequency-dependent CPHF, reading in the frequencies for the electromagnetic field perturbation. The default is a static frequency calculation. This option causes the desired frequency to be read from the input stream. The default units for this value are Hartrees. Other units may be specified by including a suffix, one of cm (cm-1) and nm (wave numbers). This option is relevant for Freq and Polar jobs.

EqSolv
Use equilibrium solvation. This is the default for static perturbations. NonEqSolv is the default for dynamic (non-zero frequency) perturbations.

Simultaneous
Use one expansion space for all variables. This is faster than using separate spaces, but is slightly less accurate. This is the default.

Separate
Use a separate expansion space for each variable in the CPHF (the opposite of Simultaneous).

XY
Treat real and imaginary perturbations together. The opposite is NoXY, which does them separately. The default is to treat them separately if nuclear perturbations are also being done, but to treat them together if there are only electromagnetic perturbations.

ZVector
Use the Z-Vector method [140,445,446] for post-SCF gradients. Allowed and the default if Hartree-Fock 2nd derivatives are not also requested. The NoZVector keyword says to use the full 3 x NAtoms CPHF for post-SCF gradients.

AO
Solve CPHF in the atomic orbital basis [436,439,442,443]. This is the default.

MO
Solve in the molecular orbital basis.

MaxInv=N
Specifies the largest reduced space for in-core inversion during simultaneous solution (up to dimension N). Larger reduced problems are solved by a second level of DIIS. The default is as large a space as memory permits.

Conver=N
Set the CPHF convergence criterion to 10-N. The default is N=9 for CPHF=Separate and N=10 for CPHF=Simultaneous (the default).

Canonical
Canonical CPHF, the default.

MOD
Use MOD orbital derivatives for SAC-CI gradients (which uses configuration selection).
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3楼2009-02-23 09:45:00
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erylingjet

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sizj(金币+1):谢谢参与
那你知道CPHF是什么参数吗?
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2楼2009-02-22 23:18:08
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mchen10

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sizj(金币+1):谢谢参与
lei0736(金币+2,VIP+0):谢谢 2-26 09:09
sizj(金币+2,VIP+0):how abou the excited state? 2-26 16:05
if you are running a frequency calculation and do not need Raman results, the electric field CPHF can be skipped by using derivative freq=noraman. But there are still other kind of CPHF, like Nuclear CPHF..
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更痛苦的是梦没醒路已经不能走了
4楼2009-02-25 13:13:39
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mchen10

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lei0736(金币+3,VIP+0):谢谢 2-28 11:43
I guess CPHF has to be involved in excited state calculations, because CPHF is an equation about i j -> a b paired orbital exchange, consequently needed by excited state calculations.

Never done that before, sry i c't help u.
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更痛苦的是梦没醒路已经不能走了
5楼2009-02-28 02:40:24
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