Note

This website is presently under development. The primary website for MOPAC is still http://openmopac.net until the majority of its contents have been migrated here.

NONR

By default, in EF the Newton-Raphson method is used. This can be suppressed if FORMD in EF fails while the maximum gradient is less than a preset limit (RCUT). To suppress it under these conditions, specify NONR.