## Firefly and PC GAMESS-related discussion club

Learn how to ask questions correctly

Re^2: solvent effect

David G.
david.grifith@gmail.com

Dear Alex

in the following you can find the values and their description. The total G as reported by FF does't include electronic part so I have added final energy to make the free energy that could be compared with the free energy reported by FF in PCM calculations.

-100.426656 : FINAL ENERGY (Hartree)

-18.394: TOTAL G (KJ/MOL)

2625.5: converts KJ/MOL to Hartree

-100.433662: free energy (Hartree)

Sincerely Yours
David

On Thu Feb 20 '14 0:19am, Alex Granovsky wrote
----------------------------------------------
>Hi,

>Dear David,

>how exactly were the numbers below obtained?

>>free energy of HF (gaseous) : -100.426656 - 18.394/2625.5 = -100.433662 H

>Could you comment on the -100.426656 - 18.394/2625.5  math?

>Kind regards,
>Alex Granovsky.
>
>
>
>On Thu Feb 13 '14 6:33am, David G. wrote
>----------------------------------------
>>Hi

>>As a test to understand how Firefly does compute and consider solvent effects the free energy of HF diatomic molecule has been calculated in gaseous state, water, and benzene to compare the results.

>>free energy of HF (gaseous) : -100.426656 - 18.394/2625.5 = -100.433662 H
>>free energy of HF (water): -100.433893 H
>>free energy of HF (benzene): -100.430009 H

>>we expected a larger difference between the values in water and benzene since HF is a highly polar molecule. I have attached the input/output files and I appreciate any comment to help us how to improve the results if it looks unwise in this state. Many Thanks
>>
>>
>>Sincerely, David
>>
>>
>>
>>
>>
>>

Thu Feb 20 '14 2:26am