A Simple 'Range Extender' for Basis Set Extrapolation Methods for MP2 and Coupled Cluster Correlation Energies

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We discuss the interrelations between various basis set extrapolation formulas and show that for the nZaPa and aug-cc-pVnZ basis set formulas, for n=4-6 their behavior closely resembles the Petersson (L+a)(-3) formula with a shift a specific to the basis set family and level of theory. This is functionally equivalent to the Pansini-Varandas extrapolation for large L. This naturally leads to a simple way to extend these extrapolations to n=7 and higher. The formula is validated by comparison with newly optimized extrapolation factors for the AV{6,7}Z basis set pairs and literature values for {6,7}ZaPa. For L >= 5, the CCSD extrapolations of both the Schwenke and Varandas type are functionally equivalent to E(L)=E-infinity+A.(L-0.30)(-3), i.e., E-infinity=E(L)+[E(L)-E(L-1)]/([(L-0.30)/(L-1.30)](3)-1)

Original languageEnglish
Title of host publicationINTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2018 (ICCMSE-2018)
EditorsTE Simos, Z Kalogiratou, T Monovasilis
PublisherAmerican Institute of Physics
Number of pages4
DOIs
StatePublished - 2018
EventInternational Conference of Computational Methods in Sciences and Engineering (ICCMSE) - Thessaloniki, Greece
Duration: 14 Mar 201818 Mar 2018

Publication series

NameAIP Conference Proceedings
Volume2040
ISSN (Print)0094-243X

Conference

ConferenceInternational Conference of Computational Methods in Sciences and Engineering (ICCMSE)
Country/TerritoryGreece
CityThessaloniki
Period14/03/1818/03/18

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