Alessandro,
Here is an input that should help you to start from existing movecs (referenced as oldrun.mos in the following input file)
start he
geometry
he 0 0 0
symmetry oh
end
basis small
* library sto-3g
end
basis large
* library ahlrichs_vtz
end
#I am assuming the molecular orbitals from the previous run are called oldrun.mos
set "ao basis" small
dft
vectors input oldrun.mos output small.mos
noscf
end
task dft
set "ao basis" large
dft
vectors input project small small.mos output large.mos
end
task dft
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