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Updated: Mar 29, 2026

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
Published on: April 8, 2020
Fully Automated Incremental Evaluation of MP2 and CCSD(T) Energies: Application to Water Clusters
Joachim Friedrich1, Michael Dolg1
1Institute for Theoretical Chemistry, University of Cologne, Greinstrasse 4, 50939 Cologne, Germany.
Abstract:
A fully automated implementation of the incremental scheme for CCSD energies has been extended to treat MP2 and CCSD(T) energies. It is shown in applications on water clusters that the error of the incremental expansion for the total energy is below 1 kcal/mol already at second or third order. It is demonstrated that the approach saves CPU time, RAM, and disk space. Finally it is shown that the calculations can be run in parallel on up to 50 CPUs, without significant loss of computer time.
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