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qwerasdf2783

金虫 (著名写手)

[求助] 计算报错 Excessive mixing of frozen core and valence orbitals如何解决

算激发态时出现问题:
输入文件是:
# ub3lyp/gen td(singlets, NStates=50) SCF=(MaxCycle=300) nosymm
分子说明
C N H O Cl 0
6-31g(d)
****
Cd 0
lanl2dz
****


以下是报错:
Restarting incremental Fock formation.
SCF Done:  E(UB+HF-LYP) =  -5392.99532795     A.U. after   45 cycles
             Convg  =    0.9280D-08             -V/T =  2.3312
             S**2   =   0.0000
Annihilation of the first spin contaminant:
S**2 before annihilation     0.0000,   after     0.0000
ExpMin= 4.05D-02 ExpMax= 2.52D+04 ExpMxC= 3.78D+03 IAcc=3 IRadAn=         5 AccDes= 0.00D+00
HarFok:  IExCor= 205 AccDes= 0.00D+00 IRadAn=         5 IDoV=1
ScaDFX=  1.000000  1.000000  1.000000  1.000000
Defaulting to unpruned grid for atomic number  48.
Defaulting to unpruned grid for atomic number  48.
Largest valence mixing into a core orbital is  6.99D-01
Largest core mixing into a valence orbital is  2.79D-01
Excessive mixing of frozen core and valence orbitals.
Error termination via Lnk1e in /export/local/g03/g03/l801.exe at Mon Apr 22 17:38:54 2013.
Job cpu time:  0 days  0 hours  2 minutes  9.5 seconds.
File lengths (MBytes):  RWF=    439 Int=      0 D2E=      0 Chk=     11 Scr=      1
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stalart

木虫 (正式写手)

【答案】应助回帖

感谢参与,应助指数 +1
beefly老大说过这个情况
说明gaussian默认设置的冻芯轨道可能不合理。在mp2计算中搜索“NFC”(也就是冻结轨道的个数)的数值,然后作一个HF计算,找到轨道输出部分,看NFC和NFC+1对应的轨道是否有较大能隙。如果比较接近,需要找一个合理的分界线,然后设定mp2(window=n),其中的n=新的NFC+1
2楼2013-04-23 20:11:59
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qwerasdf2783

金虫 (著名写手)

引用回帖:
2楼: Originally posted by stalart at 2013-04-23 20:11:59
beefly老大说过这个情况
说明gaussian默认设置的冻芯轨道可能不合理。在mp2计算中搜索“NFC”(也就是冻结轨道的个数)的数值,然后作一个HF计算,找到轨道输出部分,看NFC和NFC+1对应的轨道是否有较大能隙。如果比 ...

我看过那个贴,但我的这个是DFT的。
3楼2013-04-24 14:07:13
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