MOPAC Manual 2026.1
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MOPAC [1] is a general-purpose semiempirical quantum chemistry engine
for the study of molecular and periodic structures. This manual
documents the MOPAC engine in the 2026.1 release of the Amsterdam
Modeling Suite. The MOPAC engine shares the core routines with the
standalone MOPAC program and can be used via the AMS driver.

* "PDF version of the MOPAC Manual"

**Table of Contents:**

* Introduction

  * What's new in MOPAC 2019

* AMS driver's tasks and properties

  * Geometry, System definition

  * Tasks: exploring the PES

  * Properties in the AMS driver

* Input keywords

  * Model Hamiltonian

  * Solvation

  * Properties

  * Technical settings

  * Extra keywords

* References

* Examples

* KF output files

* FAQ
