ArticleThe journal of physical chemistry. A2024
Toward a Stochastic Complete Active Space Second-Order Perturbation Theory.
Article in The journal of physical chemistry. A, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Stochastic Difference-Dedicated Configuration Interaction for Magnetic Exchange in Large Active Spaces.Journal of chemical theory and computation · 2026Article
- Stochastic-SplitGAS: A Quantum Monte Carlo Multi-Reference Perturbation Theory Based on the Imaginary-Time Evolution of Effective Hamiltonians.Journal of chemical theory and computation · 2025Article
- FCIQMC-CASPT2 with Imaginary-Time-Averaged Wave Functions.Journal of chemical theory and computation · 2025Article
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Authors and funding
3 authors.
Funding
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Abstract
In this work, an internally contracted stochastic complete active space second-order perturbation theory, stochastic-CASPT2, is reported. The method relies on stochastically sampled reduced density matrices (RDMs) up to rank four and contractions thereof with the generalized Fock matrix. A new protocol for calculating higher-order RDMs in full configuration interaction quantum Monte Carlo (FCIQMC) has been designed based on (1) restricting sampling of the corresponding excitations to a deterministic subspace, (2) averaging the RDMs from independent dynamics and (3) projecting them onto the closest positive semi-definite matrix. Our protocol avoids previously encountered numerical conditioning problems in the orthogonalization of the perturber overlap matrix stemming from numerical noise. The chromium dimer CASSCF(12,12)/CASPT2 binding curve is computed as a proof of concept.
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Registered trials
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