What question did this study set out to answer?

The study aims to develop efficient algorithms for calculating energy gradients and nonadiabatic couplings within extended multiconfiguration quasi-degenerate perturbation theory.

July 23, 2026Journal of Chemical Theory and Computation

Efficient Algorithms for Analytical Gradients and Nonadiabatic Couplings of Second-Order Extended Multiconfiguration Quasi-Degenerate Perturbation Theory

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Authors

YBYurii V. BruyakinLomonosov Moscow State University VBVladimir E. BochenkovUniversity of Cagliari ABAnastasia V. BochenkovaLomonosov Moscow State University

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Implication

Randomized trial evaluates computational methods for energy gradients in molecular systems, suggesting enhanced efficiency.

Key Points

The study aims to develop efficient algorithms for calculating energy gradients and nonadiabatic couplings within extended multiconfiguration quasi-degenerate perturbation theory.
Introduced MPI-parallelized algorithms for analytical calculations.
Implemented algorithms in the Firefly quantum chemistry package.
Validated with benchmarks comparing analytical and numerical gradients.
Algorithms showed high computational efficiency for large active spaces.
Validated through successful optimization of conical intersection geometries.
Demonstrated mapping of potential energy surfaces for retinal protonated Schiff base.

Cite This Study

Bruyakin et al. (2026) studied this question.

synapsesocial.com/papers/6a61aea0faa9903c51169c73 https://doi.org/10.1021/acs.jctc.6c00565

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Efficient Algorithms for Analytical Gradients and Nonadiabatic Couplings of Second-Order Extended Multiconfiguration Quasi-Degenerate Perturbation Theory

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Cite This Study

Efficient Algorithms for Analytical Gradients and Nonadiabatic Couplings of Second-Order Extended Multiconfiguration Quasi-Degenerate Perturbation Theory

Discussion

Member takes

Implication

Key Points

Cite This Study

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