I noticed that some of the pseudopotentials on the QE website (e.g.
http://www.quantum-espresso.org/pseudo/1.3/UPF/H.pz-vbc.UPF,
http://www.quantum-espresso.org/pseudo/1.3/UPF/H.tpss-mt.UPF) have "-1" as the
value of the max. angular momentum component in the PP_HEADER section. It's
unclear from the page on the UPF format
(http://www.quantum-espresso.org/wiki/index.php/Unified_pseudopotential_format)
what this is supposed to mean. What is that negative value supposed to indicate?
University of Akron
Civil Engineering Department
