Free electronic energy, outdata

[quitethedude]

Hi!

I've used VASP to calculate the free electronic energy (at T>0 K, of course), but I'm not sure about the outdata. The free electronic energy is given by

Fel=Eel-TSel

(see e.g. http://www.sciencedirect.com/science/ar ... 5404000965). Naturally, one would thus think that

Fel=F-E0,

i.e., the difference between the total free energy and the energy for sigma -> 0. However, in the OUTCAR file one finds a term ENTROPY TSel which is (except for a factor of 2) equal to F-E0. Also, in the VASP manual it is stated that TSel is indeed F-E0. I've therefore got two questions:

1) Is Eel included in TSel in VASP without mention?

2) Why is TSel=2(F-E0) in OUTCAR? Where does the factor 2 come from?

[support_vasp]

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