CCL: Freq and Stability



 Sent to CCL by: "Anthony  F" [kwyjib09*_*gmail.com]
 Dear CCL,
 I've been running geometry optimizations and found stationary points. I have
 also been using SCF = QC (also UB3LYP/6-311+G(d,p) NOSYMM).
 How can I be sure that my final answer is a local minimum? When I perform a
 frequency job after the optimization, I sometimes obtain imaginary frequencies,
 suggesting an nth-order saddle point (n is the number of imaginary frequencies).
 Does this also have to do with the stability of my wavefunction? I have used the
 keyword Stable=Opt for verification. But I find that I can have both a stable
 wavefunction and imaginary frequencies. How do I then find true local minima?
 Also, is it possible to run both a STABLE and geometry OPT job with the same
 route? Or do I have to use the Link1 keyword? If so, is it possible to copy my
 checkpoint file through the route section?
 Thanks
 Anthony