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Re^2: Optimization of conical intersection with penalty function method: how to control the gap?


Dear Alex,

Thanks very much for your reply.
Just a curios question, what does the SHIFT option do?

Best regards,

On Sat Oct 22 '16 6:00pm, Alex Granovsky wrote
>Dear Evgeniy,

>there is no direct control over the energy gap for penalty-based CoIn
>optimization procedures. The gap can be controlled indirectly using
>parameters defining a penalty function. The larger is the "strength"
>of penalty function the smaller will be the gap. With Firefly, the
>strength is controlled by the parameter B of $mcaver group.

>Kind regards,
>On Sat Oct 22 '16 11:50am, GrEv wrote

>>I am doing optimization of the minimum energy conical intersection using the penalty function method, with the following input (from the manual, p. 176) :

>>$STATPT OPTTOL=0.00005 NSTEP=500 method=qa trmax=0.05 dxmax=0.05
>> HSSEND=.f. $END

>>Using this input I found a conical intersection (CoIn), with the final gap between the states of 0.003. I'd like however to have a smaller gap, let's say 0.0001. How this could be done. I've tried to use the SHIFT option in $MCAVER, setting SHIFT=0.0001. It however didn't do the job. I got a CoIn with almost the same gap as before.
>>Many thanks!


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