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First order nonadiabatic coupling matrix elements between excited states: implementation and application at the TD-DFT and pp-TDA levels



First order nonadiabatic coupling matrix elements between excited states: implementation and application at the TD-DFT and pp-TDA levels



Journal of Chemical Physics 141(24): 244105-244105



The recently proposed rigorous yet abstract theory of first order nonadiabatic coupling matrix elements (fo-NACME) between electronically excited states [Z. Li and W. Liu, J. Chem. Phys. 141, 014110 (2014)] is specified in detail for two widely used models: The time-dependent density functional theory and the particle-particle Tamm-Dancoff approximation. The actual implementation employs a Lagrangian formalism with atomic-orbital based direct algorithms, which makes the computation of fo-NACME very similar to that of excited-state gradients. Although the methods have great potential in investigating internal conversions and nonadiabatic dynamics between excited states of large molecules, only prototypical systems as a first pilot application are considered here to illustrate some conceptual aspects.

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Accession: 057881118

Download citation: RISBibTeXText

PMID: 25554131

DOI: 10.1063/1.4903986


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