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Optimized time-dependent perturbation theory for pulse-driven quantum dynamics in atomic or molecular systems

par Daems, David ;Guérin, Stéphane;Jauslin, Hans Rudolf;Keller, Arne;Atabek, Osman
Référence Physical review. A, Atomic, Molecular, and Optical Physics, 68, 5, page (514021-514024)
Publication Publié, 2003-11

Article révisé par les pairs

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Résumé :

A time-dependent perturbative approach adapted to the treatment of intense pulsed interactions was presented. It was shown that there is a freedom in choosing secular terms and use it to optimize the accuracy of the approximation. This formulation was applied to a unitary superconvergent technique and the accuracy was improved by several orders of magnitude with respect to the Magnus expansion. It was concluded that the optimization reduces to the evaluation of eigenvalues and is therefore easy to implement.