Mopac has the following meanings:
- The Missouri Pacific Railroad (MoPac)
- The Mopac Expressway, State Highway Loop 1 in Austin, Texas, named after the Missouri-Pacific-built railroad that it was built alongside
- MOPAC, a computational chemistry program
- MoPac (curling), Mountain Pacific Curling Association
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MOPAC
MOPAC is a popular computer program used in computational chemistry. It is designed to implement semi-empirical quantum chemistry algorithms, and it runs on Windows, Mac, and Linux.
MOPAC2012 is the current version. MOPAC2009 is able to perform calculations on small molecules and enzymes using PM6, PM3, AM1, MNDO, and RM1. The Sparkle model (for lanthanide chemistry) is also available. This program is available in Windows, Linux, and Macintosh. Academic users can use this program for free, whereas government and commercial users must purchase the software.
MOPAC was largely written by Michael Dewar's research group at the University of Texas at Austin. Its name is derived from Molecular Orbital PACkage, and it is also a pun on the Mopac Expressway that runs around Austin.
MOPAC2007 included the new Sparkle/AM1, Sparkle/PM3, RM1 and PM6 models, with an increased emphasis on solid state capabilities. However, it does not have yet MINDO/3, PM5, analytical derivatives, the Tomasi solvation model and intersystem crossing. MOPAC2007 was followed by the release of MOPAC2009 in 2008 which presents many improved features
