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songp295

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Density matrix is not changing but DIIS error= 2.23D-06 CofLast=-8.30D-01.
The SCF is confused.
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[ Last edited by xuefei06 on 2008-12-8 at 23:22 ]
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1/
  - SCF=qc will probably solve the problem, albeit at a cost
  - Change the SCF converger to either SD, Quadratic or Fermi
2/
  - lower the symmetry of optimize with and optimize
    with the "nosymm" keyword
3/
  - scf=(Maxconventionalcycles=300,xqc)

I solved the problem using a variation on the first suggestion. Normally the scf took less than 80 cycles to converge. So i used scf=(Maxconventionalcycles=100,xqc) which resulted in a good compromise between using scf=qc and optimisation speed. In the case of the DIIS error the scf always took more than 100 cycles before the error, so by adding scf=(Maxconventionalcycles=100,xqc) the scf switched to qc after 100 cycles in the standard DIIS mode
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2Â¥2008-12-08 11:45:10
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