On the basis set selection for calculations of core-level states: different strategies to balance cost and accuracy

Sarangi, Ronit, Vidal, Marta L., Coriani, Sonia and Krylov, Anna I. 2020. On the basis set selection for calculations of core-level states: different strategies to balance cost and accuracy. Molecular Physics 118 (19-20) , e1769872. 10.1080/00268976.2020.1769872

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Abstract

We present a study on basis set effects in correlated calculations of core-level states. While it is well recognised that the core-level states require using more extensive basis sets than their valence counterparts, the standard strategy has been to use large contracted basis sets, such as the cc-pVXZ or cc-pCVXZ series. Building upon the ideas of Besley et al. [J. Chem. Phys. 130, 124308 (2009)], we show that a much more effective strategy is to use uncontracted bases, such as core or fully uncontracted Pople's basis. The physical grounds behind this approach are explained and illustrated by numeric results. We also discuss other cost-saving strategies, such as virtual space truncation and mixed precision execution.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Chemistry
Publisher:	Taylor & Francis
ISSN:	0026-8976
Date of Acceptance:	8 May 2020
Last Modified:	27 Sep 2022 01:07
URI:	https://orca.cardiff.ac.uk/id/eprint/141363

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