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Improved implementation and application of the individually selecting configuration interaction method.

P Stampfuss1, W Wenzel

  • 1Forschungszentrum Karlsruhe, Institut für Nanotechnologie, Postfach 3640, 76021 Karlsruhe, Germany.

The Journal of Chemical Physics
|January 11, 2005
PubMed
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We enhanced the configuration-selecting multireference configuration interaction method for parallel computing, enabling larger quantum chemistry calculations. This computational chemistry advance allows for more complex molecular system studies.

Area of Science:

  • Computational chemistry
  • Quantum chemistry
  • High-performance computing

Background:

  • Multireference configuration interaction (MRCI) is crucial for accurate electronic structure calculations.
  • Large Hilbert spaces in MRCI pose significant computational challenges.

Purpose of the Study:

  • To report progress on implementing the configuration-selecting MRCI method on distributed-memory parallel architectures.
  • To enable the treatment of significantly larger Hilbert spaces for quantum chemistry problems.

Main Methods:

  • Implementation of configuration-selecting MRCI on massively parallel architectures.
  • Utilizing distributed memory for large-scale computations.
  • Analysis of code performance and scaling on IBM/SP3 and CRAY-T3E systems.

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Main Results:

  • The method now permits treatment of Hilbert spaces of dimension O(10(12)).
  • Approximately 50,000,000 configurations can be selected within the variational subspace.
  • Benchmark results are presented for dinitrosoethylene isomers and an enediyene ring closure reaction.

Conclusions:

  • The parallel implementation significantly expands the scope of tractable quantum chemical problems.
  • This approach offers a powerful tool for studying complex molecular energetics and reaction mechanisms.