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Re: Energy rises and oscillate at the end of optimization

Pavlo Solntsev
pavlo.solntsev@gmail.com


I would recommend you try these parameters first:
$contrl scftyp=rhf dfttyp=pbe96
runtyp=OPTIMIZE icharg=-1 nprint=-5
maxit=100 ICUT=11      ITOL=30 NZVAR=168 $end
$system mwords=100 $end
$SCF DIRSCF=.true. maxdii=20 $end
$guess guess=moread $end
$ZMAT DLC=.T. AUTO=.T.$end
$p2p p2p=.t. dlb=.t. $end
$basis gbasis=TZV $end
$PCM PCMTYP=DPCM SOLVNT=input RSOLV=2.155 EPS=35.688 EPSINF=1.806874 $END
$PCMCAV RIN(58)=1.956 $END

Before apply a solvent correction, you need to optimize the geometry in a gas phase. Make sure you use a right functional. I am skeptical about pbe96. Do not expect very tight gradient for the geometry with the solvent correction. Usually 10^-4 is ok.

Pavlo.



On Tue Sep 9 '14 3:30pm, Oleg Levitskiy wrote
---------------------------------------------
>Dear Firefly Users,
>I've tryed to perform an optimization of anionic complex of Ni (DFT/PBE96, PCM) and faced a problem with convergence. Energy has unexpectedly risen and fluctuate spontaneousely from step to step. I've tryed to increase accuracy (ICUT, ITOL values and also DLCTOL and ORTTOL), to change optimization method (GDIIS, NR), to perform optimization in cartesian or delocalized coordinates, but the result was similar in all cases. Could you advise me something else to solve this problem.
>The beginning of my input is following:

> $contrl scftyp=rhf dfttyp=pbe96
>runtyp=OPTIMIZE icharg=-1 nprint=-5
>maxit=100 ICUT=20 ITOL=30 NZVAR=168 $end
> $system kdiag=-1 mwords=100 $end
> $SCF DIRSCF=.true. maxdii=20 $end
> $guess guess=moread $end
> $STATPT method=NR $end
> $ZMAT DLC=.T. AUTO=.T.
>DLCTOL=1D-7 ORTTOL=1D-7 $end
> $INTGRL PACKAO=.true. $end
> $p2p p2p=.t. dlb=.t. $end
> $basis gbasis=TZV $end
> $PCM PCMTYP=DPCM SOLVNT=input RSOLV=2.155 EPS=35.688 EPSINF=1.806874 $END
> $PCMCAV RIN(58)=1.956 $END

>Typical out-file is attached.

>Thank you,

>Oleg
>


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