I ran a QST3 calculation under an expanded basis set:

S 0

6-311+G(2df,p)

****

H C N O 0

6-311+G(d,p)

****

(this is the same expanded basis set I used for optimizations)

When the calculation finished, the output provided a geometry that was nearly identical to my product but it contained 1 imaginary frequency at -255.  I don't believe this to be the transition state.  How can I refine the calculation to get a better result?

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