mopac-step 2023.7.27

A SEAMM plug-in to setup, run and analyze semiempirical calculations with MOPAC

SEAMM MOPAC plug-in

A SEAMM plug-in to setup, run and analyze semiempirical calculations with MOPAC.

This plug-in provides a graphical user interface (GUI) for setting up and running simulations using the semiempirical quantum chemistry code MOPAC.

• Free software: BSD license

• Documentation: https://molssi-seamm.github.io/mopac_step/index.html

• Code: https://github.com/molssi-seamm/mopac_step

Features

• Single-point energies

• Structural optimization

• IR and Raman vibrational frequencies

• Temperature dependent thermodynamic functions

• Results can be stored in flowchart variables or tables.

Acknowledgements

This package was created with Cookiecutter and the molssi-seamm/cookiecutter-seamm-plugin project template.

Developed by the Molecular Sciences Software Institute (MolSSI), which receives funding from the National Science Foundation under award ACI-1547580

History

2023.7.27 – Bugfix: printing bond order info

• If the bond orders were printed but not used on the system, the code crashed.

2023.7.26 – Added output of bond orders

• Also added capability to use the bond orders to put bond multiplicities on the structure.

2023.7.24 – Bugfix in Lewis structure with bond orders

• Major issue in getting the bonds from the Lewis structure where the atoms and bond orders were mixed up.

2023.6.5 – Bugfix working around MOPAC problem

• MOPAC is not consistent about putting end of file and end of program markers in the AUX file. This caused carashed in SEAMM, which this fixes until MOPAC can be corrected.

2023.4.24 – Bugfixes for Lewis structure

• Correctly handle periodic systems in Lewis structure.

• Fixed and issue with the Lewis structure GUI not displaying all the widgets.

2023.3.31 – Bugfix

Lewis structure could reference a variable before it was set, and crash.

2023.3.15 – Bugfix

A copy of the input and output files for MOPAC was inadvertently written to the main job directory. This has been fixed.

2023.2.13 – Added Lewis Structure step

Provide access to the ‘LEWIS’ keyword in MOPAC for generating the Lewis dot structure. This step also allows assigning the bonds of the system using either the connectivity or the Lewis structure.

2022.11.18 – Printing spins on atoms

Fixed an oversight that preventing printing spins on the atoms, and storing them on the structure. Also increased the precision of the AUX file so have coordinates to seven decimals, which should maintain symmetry better.

2022.11.4 – Added ForceConstant substep

Calculates and writes the Hessian (force constant) matrix to disk. Works for both molecular and periodic systems, and provides an option to control which parts of the Hessian matrix are written. Defaults to the full matrix. Also provides options to control the units of the output, with default of N/m for the atom block of the Hessian as well as the atom-cell off-diagonal block, and GPa for the cell block.

2021.2.11 (11 February 2021)

• Updated the README file to give a better description.

• Updated the short description in setup.py to work with the new installer.

• Added keywords for better searchability.

2021.2.4 (4 February 2021)

• Updated for compatibility with the new system classes in MolSystem 2021.2.2 release.

2020.12.5 (5 December 2020)

• Internal: switching CI from TravisCI to GitHub Actions, and in the process moving documentation from ReadTheDocs to GitHub Pages where it is consolidated with the main SEAMM documentation.

2020.11.2 (2 November 2020)

• Updated to be compatible with the new command-line argument handling.

2020.10.7 (7 October 2020)

• Updated to handle citations using the new framework.

2020.9.29 (29 September 2020)

• Updated to be compatible with the new system classes in MolSystem.

2020.8.1 (1 August 2020)

• Fixed bug caused by coordinates being strings, not numbers, in some cases.

2020.7.0 (23 July 2020)

• Improved the text output when running.

0.9 (15 April 2020)

• General bug fixes and cleanup of the code.

0.7.0 (17 December 2019)

• Consolidating minor changes and making a uniform release at year’s end.

0.5.1 (29 August 2019)

• First version that runs correctly and generates output.

0.2.0 (13 August 2019)

• First release on PyPI.