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.

AIGIN

Forces the geometry in the MOPAC input file to be read in Gaussian Z-matrix format. Geometry formatting is usually detected automatically, and this keyword is only necessary if the automatic detection fails. For example, the automated detection of the Gaussian Z-matrix format fails when multiple MOPAC inputs are concatenated in one input file.