Vertical valence ionization potential benchmarks from equation-of-motion coupled cluster theory and QTP functionals

The Journal of Chemical Physics
Duminda S RanasingheRodney J Bartlett

Abstract

The ionization potential (IP) of a molecule quantifies the energy required to remove an electron from the system. As such, it is a fundamental quantity in the context of redox chemistry, charge transfer, and molecular electronics. The accurate theoretical prediction of this property is therefore highly desirable for virtual materials design. Furthermore, vertical IPs are of interest in the development of many-body Green's function methods like the GW formalism, as well as density functionals and semiempirical methods. In this contribution, we report over 1468 vertical valence IPs calculated with the IP variant of equation-of-motion coupled cluster theory with singles and doubles (IP-EOM-CCSD) covering 155 molecules. The purpose of this is two-fold: First, the quality of the predicted IPs is compared with respect to experiments and higher-order coupled cluster theory. This confirms the overall high accuracy and robustness of this method, with some outliers which are discussed in detail. Second, a large set of consistent theoretical reference values for vertical valence IPs are generated. This addresses a lack of reliable reference data for lower-lying valence IPs, where experimental data are often unavailable or of dubious quali...Continue Reading

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Citations

Nov 5, 2019·The Journal of Chemical Physics·Rodney J Bartlett
Jul 30, 2019·Frontiers in Chemistry·Dorothea GolzePatrick Rinke
Aug 24, 2020·The Journal of Chemical Physics·J V Ortiz
Feb 21, 2021·The Journal of Chemical Physics·Rodrigo A MendesRodney J Bartlett
Jul 29, 2021·Journal of Chemical Theory and Computation·Yanyong WangXinguo Ren
May 19, 2020·Journal of Chemical Theory and Computation·Michael FilatovCheol Ho Choi
Aug 28, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Fatemeh Abyar, Igor Novak
Sep 10, 2020·The Journal of Physical Chemistry. a·Michael FilatovCheol Ho Choi

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