I'm trying to calculate the free energy of the following Gaussian Input File:

# opt freq b3lyp/6-31g scrf=(cpcm, solvent=water)

Fe atom

2 1

Fe

I am getting two quite different free energy values depending on the operating system on which the programme is run.

In Windows : -1263.116031 Hartree

In Linux       : -1263.165737 Hartree

I've attached the output files below. What is the cause for the deviation above?

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