Convergence issue in Gaussian I have been struggling with geometry optimization of a prostaglandin molecule (20 carbon atoms). I finally got the optimization, all right. Then I did the Frequency job on the optimized structure (I opened the Optimization job .LOG file scrolled up to the last geometry (highest number) and launched the Frequency job from there). Below is my route line from the .gjf file:

# freq=noraman cphf=noread b3lyp/6-31g(d) geom=connectivity


The Frequency job terminated normally and that's what I got in the Frequency job .LOG file:

          Item               Value     Threshold  Converged?
 Maximum Force            0.000005     0.000450     YES
 RMS     Force            0.000001     0.000300     YES
 Maximum Displacement     0.013516     0.001800     NO 
 RMS     Displacement     0.003867     0.001200     NO 
 Predicted change in Energy=-2.250043D-08


Unfortunately, there is no statement: "Stationary point found", however according to Gaussian manual: "A stationary point is found when the Maximum Force and RMS Force are two orders of magnitude smaller than the thresholds shown, regardless of the values of the displacements."

Is not it just the case? If so, why wouldn't Gaussian kindly state that the stationary point was found?
Is not it just the case?


Looks like it is indeed not the case. I think the phrase OP quoted from the manual, which says that the optimization stops when 


  The Maximum Force and RMS Force are two orders of magnitude smaller
  than the thresholds shown, regardless of the values of the
  displacements.


can be interpreted a bit differently, but I guess that algoritmically it is implemented in a pretty simple way: the above mentioned quantities should be at least 100 times smaller that the corresponding thresholds. And this is not the case for the calculation under consideration: Maximum Force value (0.000005) is not 100 times smaller (but only 90) than the threshold (0.000450).