Frankfurt 2006 – wissenschaftliches Programm

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MO: Molekülphysik

MO 28: Poster: Quantum Control

MO 28.4: Poster

Dienstag, 14. März 2006, 16:30–18:30, Labsaal

Dynamical freezing of molecular alignment. — •A. Matos-Abiague, A. S. Moskalenko, and J. Berakdar — Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany.

The sustainability in time of the alignment of diatomic molecules driven by periodic trains of short laser pulses is investigated. From an analysis of the geometry of quantum evolution we deduce necessary and sufficient conditions for dynamically freezing the time evolution of the system. Once dynamical freezing is reached, an initially aligned molecule remains well aligned for a time of the order of the duration of the complete train of pulses. The inferred necessary and sufficient conditions governing the dynamical freezing are then used for obtaining the field parameters capable of sustaining the molecular alignment. By performing a numerical simulation of the alignment of iodine monochloride molecules subject to a train of laser pulses we demonstrate that the appropriate designing of the external time-dependent field leads, indeed, to a strong, time sustainability of the molecular alignment.