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

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

2004-01-07

arxiv.org/abs/quant-ph/0401030v1

Phys. Rev. A 69, 043407 (2004)

Physics

Quantum Physics

16 pages, 6 figures

Scientific paper

10.1103/PhysRevA.69.043407

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, that is derived from this scheme, and we investigate the temperature effects on the molecular orientation dynamics.

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