[Pw_forum] Questions about PP generation

[Aldo Ugolotti]

Dear all,
I'm trying to generate a new pseudopotential for Pt atom which is based on
optB88 xc functional and after reding the notes and the slides i have
several questions:

1) atomic.x does not seem to support the generation of a PP including
vdw-df1 correction (error message: "non-local xc not implemented"). Do you
have a workaround for this? Do you think that creating a PP with just the
xc terms without the van der Waals term will introduce a significant error?

2) when i try to create a US PP i have to specify at the end of the input
file the same orbitals twice, but with different energies. I'm not looking
for unbound states, but if i set both to 0 (all-electron results) i find
some inversion errors while calculating the beta coefficients, instead if i
set some energy i get the error of dealing with unbond states. Why do i
have to do that?Is there a reference for that procedure?In RRKJ and US
papers i don't remember such requirement.

3) what is the effect of using all-electron pseudized wavefunctions for the
local part instead of using one of the orbitals as reference?

4)i did not understand how i can properly check the final PP, for example
against ghost states (other than trying it for a bulk scf or dos for
example)

Thanks in advance,
regards

Aldo Ugolotti
Università of Milano-Bicocca
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