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Updated: Jul 18, 2025

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
Published on: April 8, 2020
Converging high-level coupled-cluster energetics via adaptive selection of excitation manifolds driven by moment
Karthik Gururangan1, Piotr Piecuch1,2
1Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
Abstract:
A novel approach to rapidly converging high-level coupled-cluster (CC) energetics in an automated fashion is proposed. The key idea is an adaptive selection of excitation manifolds defining higher--than--two-body components of the cluster operator inspired by CC(P;Q) moment expansions. The usefulness of the resulting methodology is illustrated by molecular examples where the goal is to recover the electronic energies obtained using the CC method with a full treatment of singly, doubly, and triply excited clusters (CCSDT) when the noniterative triples corrections to CCSD fail.
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