Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Benchmark quasi-variational coupled cluster calculations of multiple bond breaking

Robinson, James Baden and Knowles, Peter James 2012. Benchmark quasi-variational coupled cluster calculations of multiple bond breaking. Journal of Chemical Theory and Computation 8 (8) , pp. 2653-2660. 10.1021/ct300416b

Full text not available from this repository.


We present further evidence that closed-shell single-reference coupled cluster theory can be used as a reliable predictive tool even when multiple chemical bonds are broken, provided that a near-variational, rather than projective, ansatz is used. Building on the Optimized-orbital Quasi-Variational Coupled Cluster Doubles (OQVCCD) method by adding the standard perturbative treatment of triple excitations, the OQVCCD(T) method provides outstanding accuracy for the dissociation of multiply-bonded molecules and other problems involving strong non-dynamic correlation of the electrons. We find that in the case of singly-bonded molecules, OQVCCD and OQVCCD(T) perform similarly to the equivalent Brueckner Coupled Cluster Doubles approaches, BCCD and BCCD(T). However, when multiple bonds are broken, such as in acetylene and dicarbon, OQVCCD(T) is capable of predicting both qualitatively and quantitatively accurate potential energy curves, unlike the standard methods based on Traditional Coupled Cluster theory, and for approximately the same computational cost.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Subjects: Q Science > QD Chemistry
Publisher: American Chemical Society
ISSN: 1549-9618
Last Modified: 04 Jun 2017 04:04

Citation Data

Cited 23 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item