10 Apr 2024 | Antoine Marie and Pierre-François Loos
This paper presents a comprehensive set of reference energies for satellite transitions and valence ionizations in small molecular systems. The authors report 42 satellite transition energies and 58 valence ionization potentials computed using full configuration interaction (FCI) quality methods. These energies are derived from the configuration interaction using a perturbative selection made iteratively (CIPSI) method, following the protocol developed for the QUEST database. The accuracy of the coupled-cluster (CC) hierarchy (CC2, CCSD, CC3, CCSDT, CC4, and CCSDTQ) is evaluated against these new reference energies. Additionally, the performance of various many-body Green's function methods (GW, GF2, and T-matrix) for ionization potentials is analyzed, highlighting their limitations in accurately modeling satellite transitions. The study aims to establish a benchmark set for satellite energies, which is crucial for evaluating the accuracy of theoretical methods in computational chemistry.This paper presents a comprehensive set of reference energies for satellite transitions and valence ionizations in small molecular systems. The authors report 42 satellite transition energies and 58 valence ionization potentials computed using full configuration interaction (FCI) quality methods. These energies are derived from the configuration interaction using a perturbative selection made iteratively (CIPSI) method, following the protocol developed for the QUEST database. The accuracy of the coupled-cluster (CC) hierarchy (CC2, CCSD, CC3, CCSDT, CC4, and CCSDTQ) is evaluated against these new reference energies. Additionally, the performance of various many-body Green's function methods (GW, GF2, and T-matrix) for ionization potentials is analyzed, highlighting their limitations in accurately modeling satellite transitions. The study aims to establish a benchmark set for satellite energies, which is crucial for evaluating the accuracy of theoretical methods in computational chemistry.