The real energy shift vrcorr moves in the final and the
imaginary energy shift vicorr adds broadening to the result. The real
energy shift is useful to correct the error in FEFF's Fermi
level estimate and the imaginary part can be used to correct
for experimental resolution or errors in the core-hole lifetime.
This error in the Fermi level is typically about 1 eV with self-consistent
calculations and about 3 eV with overlapped atom potentials. The imaginary
energy is typically used to correct for instrument broadening or as
a correction to the mean free path calculated by FEFF. This
affects only the module ff2x, which combines the results in all of
the `feffNNNN.dat' files. This card is useful in fitting loops
because you can simply make such energy corrections and see the results
without redoing the entire XAFS parameter calculation. CAUTION: the
results are not as accurate as those obtained with the EXCHANGE card.
Both energies are in eV.
(See also the EXCHANGE card
* Reduce E0 by 3.0 eV and add 1 eV of broadening (full width)
* This will only affect module ff2x
CORRECTIONS 3.0 1.0 real shift, imag shift