I want ask about the QST3. I make the run and the message Lnk1e in /usr/local/gaussian//g09/l103.exe I used opt=CalcAll and tried Opt=CalcFC both give me the same message.
You have to use Opt=QST3 instead.
The input file must have a special formating with 3 structures (reactants, products, and an initial guess for the transition structure) as detailed in: http://www.gaussian.com/g_whitepap/qst2.htm
I recommend you to use TSQ instead of QST with changing conditions. It will take time but will give you a good result
I suggest you to make sure the atom numbering is right. Most of the weird error in the QST3 algorith are made with a simple error in the atom's number within the molecule. Also, remember leave an space between the cartesian coordinates of R, TS and P. Have yu checked that reactant and products are stationary points?. If no, optimize them and then continue with the procedure.
Best,
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