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- W2621130359 abstract "G0W0 calculations for predicting vertical ionization potentials (IPs) and electron affinities of molecules and clusters are known to show a significant dependence on the density functional theory (DFT) starting point. A number of nonempirical procedures to find an optimal starting point have been proposed, typically based on tuning the amount of HF exchange in the underlying hybrid functional specifically for the system at hand. For the case of π-conjugated molecular chains, these approaches lead to a significantly different amount of HF exchange for different oligomer sizes. In this study, we analyze if and how strongly this size dependence affects the ability of nonempirical tuning approaches to predict accurate IPs for π-conjugated molecular chains of increasing chain length. To this end, we employ three different nonempirical tuning procedures for the G0W0 starting point to calculate the IP of polyene oligomers up to 22 repeat units and compare the results to highly accurate coupled-cluster calculations. We find that, despite its size dependence, using an IP-tuned hybrid functional as a starting point for G0W0 yields excellent agreement with the reference data for all chain lengths." @default.
- W2621130359 created "2017-06-09" @default.
- W2621130359 creator A5017575069 @default.
- W2621130359 creator A5085932035 @default.
- W2621130359 date "2017-09-15" @default.
- W2621130359 modified "2023-09-23" @default.
- W2621130359 title "Size-Dependence of Nonempirically Tuned DFT Starting Points for <i>G</i><sub>0</sub><i>W</i><sub>0</sub> Applied to π-Conjugated Molecular Chains" @default.
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- W2621130359 doi "https://doi.org/10.1021/acs.jctc.7b00557" @default.
- W2621130359 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28862849" @default.
- W2621130359 hasPublicationYear "2017" @default.
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