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This paper studies the effectiveness of multiobjective genetic and evolutionary algorithms in multiscaling excited state direct dynamics in photochemistry via rapid reparameterization of semiempirical methods. Using a very limited set of ab initio and experimental data, semiempirical parameters are reoptimized to provide globally accurate potential energy surfaces, thereby eliminating the need for a fullfledged ab initio dynamics simulations, which is very expensive. Through reoptimization of the semiempirical methods, excitedstate energetics are predicted accurately, while retaining accurate groundstate predictions. The results show that the multiobjective evolutionary algorithm consistently yields solutions that are significantly better—up to 230% lower in error in energy and 86.5% lower in error in energygradient—than those reported in literature. Multiple highquality parameter sets are obtained that are verified with quantum dynamical calculations, which show nearideal behavior on critical and untested excited state geometries. The results demonstrate that the reparameterization strategy via evolutionary algorithms is a promising way to extend direct dynamics simulations of photochemistry to multipicosecond time scales.
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