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shinee

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[交流] 【求助】casscf优化收敛失败--急求助 已有3人参与

大家好,我输入文件
# opt casscf(4,6,nroot=2)/6-311++g(3df,3pd)  opt=loose test,输出结果为
Final one electron symbolic density matrix:
                1             2             3             4             5
      1  0.113951D+01
      2  0.458731D+00  0.134288D+01
      3 -0.536106D+00 -0.816492D+00  0.149265D+01
      4  0.381082D-01  0.181607D-01  0.604953D-02  0.156365D-01
      5 -0.180658D-01  0.175158D-01 -0.721314D-02 -0.954064D-03  0.237741D-02
      6  0.555171D-01  0.108678D+00 -0.289718D-01 -0.793470D-02 -0.406975D-02
                6
      6  0.693603D-02
Convergence failure -- run terminated.
Error termination via Lnk1e in d:\program files\gaussian 03w\l510.exe at Sat Jul 17 21:40:10 2010.
还有也用了opt(maxcycle=N),用了scf=sleazy,用了SCF(MaxCycle=N)都是收敛失败l510错误,应该怎么办?对于加scf=qc我用这个一算就错不知为什么,还有忽略收敛加关键词iop(5/13=1),也是不能算?望高手指点谢谢。
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ggdh

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先用小基组
2楼2010-07-18 14:00:28
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seainthesky

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1. try to use converged scf orbitals to do casscf which helps converge;
2. try to use smaller active space, then use the orbitals to do bigger cas;
3. use smaller basis set
3楼2010-07-18 20:06:02
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shinee

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引用回帖:
Originally posted by seainthesky at 2010-07-18 20:06:02:
1. try to use converged scf orbitals to do casscf which helps converge;
2. try to use smaller active space, then use the orbitals to do bigger cas;
3. use smaller basis set

谢谢,如果casscf方法san收敛失败,
Final one electron symbolic density matrix:
                1             2             3
      1  0.100000D+01
      2  0.118643D-08  0.158821D+01
      3 -0.917224D-09  0.984314D+00  0.141179D+01
Convergence failure -- run terminated.
Error termination via Lnk1e in d:\program files\gaussian 03w\l510.exe at Mon Jul 19 10:57:19 2010.应该怎么办?

[ Last edited by shinee on 2010-7-19 at 12:12 ]
4楼2010-07-19 10:58:54
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