| 3:56:25 PM PST - Tue, Nov 13th 2012 |
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i'm calculating the electronic coupling between an oxygen atom and an oxygen anion. I change the distance from 3.0, 3.5, 4.0, 4.5 to 5.0 A. The coupling values decrease from 3.0 to 3.5 to 4.0, which is as expected. However, the coupling values then increase from 4.0 to 4.5 to 5.0, which is weired, anything wrong with my input?
ps, i have tried the nofock keyword and several different basis sets. this always happens. Below is my input:
charge 0
geometry noautosym
O 0.0 0.0 0.0
end
basis
O library 6-31G*
end
scf
triplet
uhf
maxiter 500
vectors output 0.movecs
end
task scf
charge -1
geometry noautosym
O 0.0 0.0 0.0
end
basis
O library 6-31G*
end
scf
doublet
uhf
maxiter 500
vectors output 1.movecs
end
task scf
charge -1
geometry noautosym
O 5.0 0.0 0.0
O 0.0 0.0 0.0
end
basis
O library 6-31G*
end
scf
nopen 3
uhf
maxiter 500
vectors input fragment 0.movecs 1.movecs output initial.movecs
end
task scf
charge -1
geometry noautosym
O 5.0 0.0 0.0
O 0.0 0.0 0.0
end
basis
O library 6-31G*
end
scf
nopen 3
uhf
maxiter 500
vectors initial.movecs reorder 2 1 output final.movecs
end
task scf
et
vectors reactants initial.movecs
vectors products final.movecs
end
basis
O library 6-31G*
end
task scf et
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