This completes without errors:
START bf
TITLE "CIS/6-31G* BF optimization frequencies"
GEOMETRY
symmetry group c1
B 0.0 0.0 0.0
F 0.0 0.0 1.2
END
BASIS
* library 6-31G*
END
DFT
XC HFExch
END
TDDFT
CIS
NROOTS 3
NOTRIPLET
TARGET 1
CIVECS
GRAD
ROOT 1
END
END
TASK TDDFT OPTIMIZE
TASK TDDFT FREQUENCIES
I cribbed from QA/tests/bf_cis, which actually seems to be basically the calculation you are trying here but with a somewhat updated input deck. It is properly documented in the NWChem 6.5 online docs: http://nwchemgit.github.io/index.php/Release65:Excited-State_Calculations#GRAD_--_analytical...
The default documentation seems to still be for an older version, so you wouldn't see what is needed: http://nwchemgit.github.io/index.php/Excited-State_Calculations (no mention of grad or civecs).
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