An excitation matched local correlation approach to excited state specific perturbation theory

2025/05/13 by Clune, Rachel, Neuscamman, Eric · 2 citations
#Chemical Physics (physics.chem-ph) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2505.08659

Abstract

We develop a cubic scaling approach to excited-state-specific second order perturbation theory in which the completeness of a local correlation treatment is carefully matched between the ground and excited state. With this matching, the accuracy of the parent method is maintained even as substantial portions of the correlation energy are neglected. Even when treating a long-range charge transfer excitation, cubic scaling is achieved in systems with as few as ten non-hydrogen atoms. In a test on the influence of an explicit solvent molecule on a long range charge transfer, the approach is qualitatively more accurate than EOM-CCSD and reproduces CC3's excitation energies and excited state potential energy surface to within about 0.1 eV and 0.5 kcal/mol, respectively.

Citations

• Improving Aufbau Suppressed Coupled Cluster Through Perturbative Analysis
• Efficient Implementation of the Random Phase Approximation with Domain-based Local Pair Natural Orbitals
• Efficient Implementation of the Random Phase Approximation with Domain-Based Local Pair Natural Orbitals
• A generalized variational principle with applications to excited state mean field theory

Cited by

• One-Body Properties and Their Perturbative Accuracy with Aufbau Suppressed Coupled Cluster Theory
• Fast and Accurate Charge Transfer Excitations via Nested Aufbau Suppressed Coupled Cluster

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