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# wrong auto DF-SCF basis for def2 bases

1 year 10 months ago #607 by hokru
version: 2018-05-23.
It seems that for the H atom the AO basis is used if dfbasis_scf=auto and basis=def2-TZVPP or def2-TZVP. It worked in the previous version. I did not test others.

Fitting basis set for the SCF calculation:

1  C  def2-qzvpp-ri-jk [ 14s 10p 6d 2f 1g | 10s 8p 5d 1f 1g ]
2  H  def2-qzvpp [ 7s 3p 2d 1f | 4s 3p 2d 1f ]
...

Cheers,
Holger

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1 year 10 months ago #608
Dear Holger,

The AO basis is set as dfbasis_scf only for the H atom by design, starting from the 2018-05-23 version, because for H the def2-qzvpp(d)-ri-jk is much smaller than the def2-qzvpp(d) basis. This change does not effect the previous dfbasis_scf selection for other than H atoms. The numerical difference between the two choices should be negligible.

If in your case dfbasis_scf=def2-qzvpp-ri-jk is desired, set dfbasis_scf=def2-qzvpp-ri-jk in the input file. This, however, might not be sufficiently large, if you use basis=def2-QZVP(PD) for molecules rich in H atoms.

I hope that helps,
Peter
The following user(s) said Thank You: hokru

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1 year 10 months ago #609 by hokru
Oh okay! Thanks for clearing that up.
I understand the reasoning behind it, was just surprised by the change.

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