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Published on: June 7, 2018
Communication: An efficient approach to compute state-specific nuclear gradients for a generic state-averaged
1Firefly project, Moscow, 117593 Moscow, Russian Federation.
Abstract:
We present a new, very efficient semi-numerical approach for the computation of state-specific nuclear gradients of a generic state-averaged multi-configuration self consistent field wavefunction. Our approach eliminates the costly coupled-perturbed multi-configuration Hartree-Fock step as well as the associated integral transformation stage. The details of the implementation within the Firefly quantum chemistry package are discussed and several sample applications are given. The new approach is routinely applicable to geometry optimization of molecular systems with 1000+ basis functions using a standalone multi-core workstation.
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