Some Observations on Counterpoise Corrections for Explicitly Correlated Calculations on Noncovalent Interactions
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- 作者：Brina Brauer ; Manoj K. Kesharwani ; Jan M. L. Martin
- 刊名：Journal of Chemical Theory and Computation
- 出版年：2014
- 出版时间：September 9, 2014
- 年：2014
- 卷：10
- 期：9
- 页码：3791-3799
- 全文大小：285K
- ISSN：1549-9626
文摘
The basis set convergence of explicitly correlated ab initio methods, when applied to noncovalent interactions, has been considered in the presence (and absence) of Boys鈥揃ernardi counterpoise corrections, as well as using 鈥渉alf-counterpoise鈥?(the average of raw and counterpoise-corrected values) as recently advocated in this journal [Burns, L. A.; Marshall, M. S.; Sherrill, C. D. J. Chem. Theory Comput. 2014, 10, 49鈥?7]. Reference results were obtained using basis sets so large that BSSE (basis set superposition error) can be shown to be negligible. For the HF+CABS component, full counterpoise unequivocally exhibits the fastest basis set convergence. However, at the MP2-F12 and CCSD(T*)-F12b levels, surprisingly good uncorrected results can be obtained with small basis sets like cc-pVDZ-F12, owing to error compensation between basis set superposition error (which overbinds) and intrinsic basis set insufficiency (which underbinds). For intermediate sets like cc-pVTZ-F12, 鈥渉alf鈥揾alf鈥?averages work best, while for large basis sets like cc-pVQZ-F12, full counterpoise may be preferred but BSSE in uncorrected values is tolerably small for most purposes. A composite scheme in which CCSD(T)鈥揗P2 鈥渉igh level corrections鈥?obtained at the CCSD(T*)-F12b/cc-pVDZ-F12 level are combined with 鈥渉alf-counterpoise鈥?MP2-F12/cc-pVTZ-F12 interaction energies yields surprisingly good performance for standard benchmark sets like S22 and S66.