Time-dependent unitary perturbation theory for intense laser-driven molecular orientation

D. Sugny, A. Keller, O. Atabek, D. Daems, S. Guérin, and H. R. Jauslin
Phys. Rev. A 69, 043407 – Published 20 April 2004

Abstract

We apply a time-dependent perturbation theory based on unitary transformations combined with averaging techniques, on molecular orientation dynamics by ultrashort pulses. We test the validity and the accuracy of this approach on LiCl described within a rigid-rotor model and find that it is more accurate than other approximations. Furthermore, it is shown that a noticeable orientation can be achieved for experimentally standard short laser pulses of zero time average. In this case, we determine the dynamically relevant parameters by using the perturbative propagator, which is derived from this scheme, and we investigate the temperature effects on molecular dynamics.

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  • Received 4 August 2003

DOI:https://doi.org/10.1103/PhysRevA.69.043407

©2004 American Physical Society

Authors & Affiliations

D. Sugny*, A. Keller, and O. Atabek

  • Laboratoire de Photophysique Moléculaire du CNRS, Université Paris-Sud, Bâtiment 210—Campus d’Orsay, 91405 Orsay Cedex, France

D. Daems

  • Center for Nonlinear Phenomena and Complex Systems, Université Libre de Bruxelles, Campus Plaine 231, 1050 Brussels, Belgium

S. Guérin and H. R. Jauslin

  • Laboratoire de Physique de l’Université de Bourgogne, UMR CNRS 5027, Boîte Postale 47870, 21078 Dijon, France

  • *Electronic address: dominique.sugny@u-bourgogne.fr
  • Electronic address: ddaems@ulb.ac.be
  • Electronic address: sguerin@u-bourgogne.fr

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Vol. 69, Iss. 4 — April 2004

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