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Updated: Oct 4, 2025

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MacroQC 1.0: An electronic structure theory software for large-scale applications.

Uğur Bozkaya1, Betül Ermiş1, Yavuz Alagöz1

  • 1Department of Chemistry, Hacettepe University, Ankara 06800, Turkey.

The Journal of Chemical Physics
|February 2, 2022
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Summary

MacroQC is a new quantum chemistry software designed for high-accuracy computations. It offers efficient analytical gradients for various many-body perturbation theory and coupled-cluster methods, enabling large-scale chemical applications.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Software Development

Background:

  • Accurate quantum chemical calculations are crucial for understanding molecular properties and reactions.
  • Existing software may face limitations in efficiency and scalability for complex systems.
  • Development of specialized tools is needed for advanced computational chemistry applications.

Purpose of the Study:

  • Introduce MacroQC, a novel quantum chemistry software package.
  • Highlight its capabilities for high-accuracy computations and large-scale chemical applications.
  • Detail its unique features and potential benefits for scientific research.

Main Methods:

  • Implementation of various many-body perturbation theory and coupled-cluster (CC) methods.
  • Development of efficient analytical gradient calculations, including density-fitting approaches.
  • Inclusion of advanced features like orbital-optimized methods and molecular fragmentation.

Main Results:

  • MacroQC provides efficient analytical gradients for second-order perturbation theory, CC singles and doubles (CCSD), and CCSD with perturbative triples.
  • The software incorporates unique features such as density-fitting, orbital optimization, and extended Koopman's theorem.
  • The linear-scaling systematic molecular fragmentation (LSSMF) method allows application to large molecular systems.

Conclusions:

  • MacroQC is a valuable tool for high-accuracy quantum chemistry computations.
  • Its efficient algorithms and unique features facilitate the study of large molecular systems.
  • The software's plugin system offers flexibility and interoperability for broader scientific applications.