Analytical formulae for the energy gradient within the quadratic configuration interaction singles and doubles (QCISD) method are derived and their implementation is discussed. The method is applied to 6-3 lG(d) computations on H,O and HzOz.
On the efficient evaluation of analytic energy gradients
β Scribed by J.E. Rice; R.D. Amos
- Book ID
- 103023673
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 469 KB
- Volume
- 122
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
in Cinal form 14 Ocloher 19S5 Melhods for the efficicn~ evaluakm of anal~ric encr&v gradicnu wilh corrclawd wavcrunclions arc discusssd. II is colxludcd rhar no gmdicnt. and in particular the Cl gradicn1 with MC SCF orhiuals. requires rhc storage
π SIMILAR VOLUMES
## Abstract The expressions of analytical energy gradients in density functional theory and their implementation in programs are reported. The evaluation of analytical energy gradients can be carried out in the fully 4βcomponent relativistic, approximate relativistic, and nonrelativistic density fu
The first use of the Gaussian very fast multipole method (GvFMM) for calculating the integral derivatives that arise in the Coulomb terms of density-functional theory (DFT) energy gradients is reported. Tests of the GvFMM gradient algorithm indicate that its accuracy, speed, and near-linear scaling