Multiobjective genetic algorithms for multiscaling excited state direct dynamics in photochemistry
11 July 2006Sastry, K., Johnson, D.D., Thompson, A. L., Goldberg, D. E., Martinez, T. J., Leiding, J., Owens, J. (2006). Proceedings of the 2006 Genetic and Evolutionary Computation Conference, 1745—1752. [Full paper - PDF] [Full paper - PS] [Presentation slides]. [Best paper award in Real World Applications track] [Silver Humie award at the Human Competitive Results Competition].
Abstract:
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 full-fledged ab initio dynamics simulations, which is very expensive. Through reoptimization of the semiempirical methods, excited-state energetics are predicted accurately, while retaining accurate ground-state 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 energy-gradient—than those reported in literature. Multiple high-quality parameter sets are obtained that are verified with quantum dynamical calculations, which show near-ideal 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 multi-picosecond time scales.
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