D.01 is stubborn, slow, and occasionally infuriating. But it is consistent .
Here are the three most common "Off..." scenarios I’ve debugged with this specific revision, and how to fix them. The symptom: Your molecule starts optimizing fine, then suddenly the bonds stretch to 5 Angstroms, and the energy goes positive. The log file says Optimization stopped without a clear reason. Posts tagged Gaussian 09W 9.5 Revision D.01 Off...
Ghosts in the Machine: Troubleshooting Gaussian 09W Rev. D.01 (and Why You Might Still Need It) The symptom: Your molecule starts optimizing fine, then
Let’s be honest—G09W D.01 is quirky. It is the grumpy sysadmin of quantum chemistry software. It works flawlessly until it suddenly doesn’t, usually at 2:00 AM before a paper deadline. If you are still running
If you are still running , you are likely in one of two camps: a computational chemist clinging to a validated workflow, or a graduate student forced to use the license dongle from 2014 that refuses to die.