Chemical Physics Letters, Vol.423, No.4-6, 413-416, 2006
Single point calculations using geometries derived at a lower level of theory: Caveats to be observed in using compound levels of theory or'double-barrelling'
A rationale is provided for judging whether particular levels of theory can be safely used together for accurate quantum mechanical energy calculations at compound levels of theory, the 'double-barrelling' technique. Other caveats are also discussed. (c) 2006 Elsevier B.V. All rights reserved.