Infoscience

Journal article

Molecular dynamics in electronically excited states using time-dependent density functional theory

The authors describe two different implementations of time-dependent d. functional theory (TDDFT) for use in excited state mol. dynamics simulations. One is based on the linear response formulation (LR-TDDFT), whereas the other uses a time propagation scheme for the electronic wave functions (P-TDDFT). Photoinduced cis-trans isomerization of C=C, C=N and N=N double bonds is investigated in three model compds., namely the 2,4-pentadiene-1-iminium cation (PSB), formaldimine and diimide. For formaldimine and diimide, the results obtained with both schemes are in agreement with exptl. data and previously reported theor. results. Mol. dynamics simulations yield new insights into the relaxation pathways in the excited state. For PSB, which is a model system for the retinal protonated Schiff base involved in the visual process, the forces computed from the LR-TDDFT S1 surface lead to an increased bond length alternation and, consequently, to single bond rotation. On the contrary, P-TDDFT dynamics lead to a decreased bond length alternation, in agreement with CASPT2 and restricted open-shell Kohn-Sham (ROKS) calcns. [on SciFinder (R)]

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