run spherical atom with evenly distributed valence electron


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Hi,

I'm trying to run spherical atom with evenly distributed valence electron occupancy.
For example, the oxygen atom electron configuration is 1s2 2s2 2p4. Is there any way in NWChem that can be used to evenly distribute those 4 valence electrons in p orbitals so that spherical results can be obtained?

thanks,
alexx

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Alexx
You can get a DFT solution with spherically averaged occupation by using a high symmetry point group, plus enforcing fractional occupation (either using the smear or fon keywords. Here are the two related input files


title "O atom spherical average using the smear keyword"

start o_atom_smear

geometry
 O 0.0 0.0 0.0
 symmetry oh
end
basis
 O library aug-cc-pvtz
end
dft
 smear 1d-6
 grid fine
 convergence energy 1d-9
end

task dft



title "O atom spherical average using the fon keyword"

start o_atom_fon

geometry
 O 0.0 0.0 0.0
 symmetry oh
end
basis
 O library aug-cc-pvtz
end
dft
 fon partial 3 electrons 4 filled 2
 grid fine
 convergence energy 1d-9
end

task dft


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