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.

SLOG

The line-search mechanism in the L-BFGS geometry optimization is replaced with a constant step size. This prevents large steps that could waste time or even cause a failure to achieve an SCF. If SLOG is used, changes individual coordinate parameters are limited to 0.20 Å, otherwise if SLOG=n.nn is used, the limit is n.nn Å.