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<H1><A ID="SECTION00020000000000000000">
1 Introduction</A>
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<EM>When I started to do my first first-principle calculation
(that is, my first<SUP>2</SUP>-principle calculation) with Stefano Baroni
on CsI under pressure (1985), it became quickly evident that
available pseudopotentials (PP's) couldn't do the job. So we
generated our own PP's. Since that first experience I have
generated a large number of PP's and people keep asking me
new PP's from time to time. I am happy that "my" PP's are
appreciated and used by other people. I don't think however
that the generation of PP's is such a hard task that it requires
an official (or unofficial) PP wizard to do this. For this reason
I want to share here my (little) experience.
</EM>
<P>
<EM>These notes are written in general but having in mind the capabilities of
the <TT>atomic</TT> package, included in the Q<SMALL>UANTUM </SMALL>ESPRESSO
distribution
(<TT>http://www.quantum-espresso.org</TT>). <TT>atomic</TT>, mostly written
and maintained by Andrea Dal Corso and others, is the evolution of
an older code I maintained for several years. <TT>atomic</TT> can generate
both Norm-Conserving (NC) [<A
HREF="node21.html#NC">1</A>] and Ultrasoft (US) [<A
HREF="node21.html#van">2</A>] PP's,
plus Projector Augmented Waves (PAW) [<A
HREF="node21.html#PAW">3</A>] sets.
It allows multiple projectors, full relativistic calculations,
spin-split PP's for spin-orbit calculations.
For the complete description of the input of <TT>atomic</TT>,
please refer to files <TT>INPUT_LD1.txt</TT> and
<TT>INPUT_LD1.html</TT>.
</EM>
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<LI><A ID="tex2html70"
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<LI><A ID="tex2html71"
HREF="node4.html">1.2 About similar work</A>
<LI><A ID="tex2html72"
HREF="node5.html">1.3 Pseudopotential generation, in general</A>
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