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Options for MP2 geometry optimization for large systems

GrEv
grevgen13@gmail.com

Hello,

I found in the manual the following recommendations for MP2 geom. optimization for large systems:

$MP2GRD DBLBF=.F. FUSED=.F. ASYNC=.T. $END

I wonder why it is better to have DBLBF=.F. FUSED=.F., which are both .T. by default?

Many thanks!

Best regards,
Evgeniy

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