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New Gradient Correction Scheme for Electronically Nonadiabatic Dynamics Involving Multiple Spin States by Yinan Shu; Linyao Zhang; Dihua Wu; Xiye Chen; Shaozeng Sun; Donald G. Truhlar is a Physics and Astronomy article available to read on EtoBox.

What is New Gradient Correction Scheme for Electronically Nonadiabatic Dynamics Involving Multiple Spin States about?

It has been recommended that the best representation to use for trajectory surface hopping (TSH) calculations is the fully adiabatic basis in which the Hamiltonian is diagonal. Simulations of intersystem crossing processes with conventional TSH methods require an explicit computation of nonadiabatic coupling vectors (NACs) in the molecular−Coulomb−Hamiltonian (MCH) basis, also called the spin− orbit-free basis, in order to compute the gradient in the fully adiabatic basis (also called the diagonal representation). This explicit requirement destroys some of the advantages of the overlap-based algorithms and curvature-driven algorithms that can be used for the most efficient TSH calculations. Therefore, although these algorithms allow one to perform NAC-free simulations for internal conversion processes, one still requires NACs for intersystem crossing. Here, we show that how the NAC requirement is circumvented by a new computation scheme called the time-derivative-matrix scheme.

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Author

Yinan Shu; Linyao Zhang; Dihua Wu; Xiye Chen; Shaozeng Sun; Donald G. Truhlar

Publisher

American Chemical Society (ACS)

Published

2023

Language

EN

Field

Physics and Astronomy (Physical Sciences)